/* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
/* in SG, when using CONTEXT_UCONTEXT, xbt_os_thread_stub is used instead */
-/* Copyright 2006,2007 Malek Cherier, Martin Quinson
+/* Copyright 2006,2007 Malek Cherier, Martin Quinson
* All right reserved. */
/* This program is free software; you can redistribute it and/or modify it
#include "xbt/sysdep.h"
#include "xbt/ex.h"
-#include "xbt/ex_interface.h" /* We play crude games with exceptions */
+#include "xbt/ex_interface.h" /* We play crude games with exceptions */
#include "portable.h"
-#include "xbt/xbt_os_time.h" /* Portable time facilities */
-#include "xbt/xbt_os_thread.h" /* This module */
-#include "xbt_modinter.h" /* Initialization/finalization of this module */
+#include "xbt/xbt_os_time.h" /* Portable time facilities */
+#include "xbt/xbt_os_thread.h" /* This module */
+#include "xbt_modinter.h" /* Initialization/finalization of this module */
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os,xbt,"Synchronization mechanism (OS-level)");
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt,
+ "Synchronization mechanism (OS-level)");
/* ********************************* PTHREAD IMPLEMENTATION ************************************ */
#ifdef HAVE_PTHREAD_H
+
#include <pthread.h>
#include <semaphore.h>
+#ifdef HAVE_MUTEX_TIMEDLOCK
+/* redefine the function header since we fail to get this from system headers on amd (at least) */
+int pthread_mutex_timedlock(pthread_mutex_t * mutex,
+ const struct timespec *abs_timeout);
+#endif
+
+
+/* use named sempahore when sem_init() does not work */
+#ifndef HAVE_SEM_INIT
+static int next_sem_ID = 0;
+static xbt_os_mutex_t next_sem_ID_lock;
+#endif
+
typedef struct xbt_os_thread_ {
- pthread_t t;
- char *name;
- void *param;
- pvoid_f_pvoid_t start_routine;
- ex_ctx_t *exception;
-} s_xbt_os_thread_t ;
+ pthread_t t;
+ char *name;
+ void *param;
+ pvoid_f_pvoid_t start_routine;
+ ex_ctx_t *exception;
+} s_xbt_os_thread_t;
static xbt_os_thread_t main_thread = NULL;
/* thread-specific data containing the xbt_os_thread_t structure */
static int thread_mod_inited = 0;
/* frees the xbt_os_thread_t corresponding to the current thread */
-static void xbt_os_thread_free_thread_data(void*d){
- free(d);
+static void xbt_os_thread_free_thread_data(void *d)
+{
+ free(d);
}
/* callback: context fetching */
-static ex_ctx_t *_os_thread_ex_ctx(void) {
+static ex_ctx_t *_os_thread_ex_ctx(void)
+{
return xbt_os_thread_self()->exception;
}
/* callback: termination */
-static void _os_thread_ex_terminate(xbt_ex_t * e) {
+static void _os_thread_ex_terminate(xbt_ex_t * e)
+{
xbt_ex_display(e);
abort();
/* FIXME: there should be a configuration variable to choose to kill everyone or only this one */
}
-void xbt_os_thread_mod_init(void) {
- int errcode;
-
- if (thread_mod_inited)
- return;
-
- if ((errcode=pthread_key_create(&xbt_self_thread_key, NULL)))
- THROW0(system_error,errcode,"pthread_key_create failed for xbt_self_thread_key");
+void xbt_os_thread_mod_init(void)
+{
+ int errcode;
+
+ if (thread_mod_inited)
+ return;
+
+ if ((errcode = pthread_key_create(&xbt_self_thread_key, NULL)))
+ THROW0(system_error, errcode,
+ "pthread_key_create failed for xbt_self_thread_key");
- main_thread=xbt_new(s_xbt_os_thread_t,1);
- main_thread->name = (char*)"main";
- main_thread->start_routine = NULL;
- main_thread->param = NULL;
- main_thread->exception = xbt_new(ex_ctx_t, 1);
- XBT_CTX_INITIALIZE(main_thread->exception);
+ main_thread = xbt_new(s_xbt_os_thread_t, 1);
+ main_thread->name = (char *) "main";
+ main_thread->start_routine = NULL;
+ main_thread->param = NULL;
+ main_thread->exception = xbt_new(ex_ctx_t, 1);
+ XBT_CTX_INITIALIZE(main_thread->exception);
- __xbt_ex_ctx = _os_thread_ex_ctx;
- __xbt_ex_terminate = _os_thread_ex_terminate;
+ __xbt_ex_ctx = _os_thread_ex_ctx;
+ __xbt_ex_terminate = _os_thread_ex_terminate;
+
+ thread_mod_inited = 1;
+
+#ifndef HAVE_SEM_WAIT
+ next_sem_ID_lock = xbt_os_mutex_init();
+#endif
- thread_mod_inited = 1;
}
-void xbt_os_thread_mod_exit(void) {
- /* FIXME: don't try to free our key on shutdown.
- Valgrind detects no leak if we don't, and whine if we try to */
-// int errcode;
-
-// if ((errcode=pthread_key_delete(xbt_self_thread_key)))
-// THROW0(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
+
+void xbt_os_thread_mod_exit(void)
+{
+ /* FIXME: don't try to free our key on shutdown.
+ Valgrind detects no leak if we don't, and whine if we try to */
+ // int errcode;
+
+ // if ((errcode=pthread_key_delete(xbt_self_thread_key)))
+ // THROW0(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
+ free(main_thread->exception);
+ free(main_thread);
+ main_thread = NULL;
+ thread_mod_inited = 0;
+#ifndef HAVE_SEM_WAIT
+ xbt_os_mutex_destroy(next_sem_ID_lock);
+#endif
+
+ /* Restore the default exception setup */
+ __xbt_ex_ctx = &__xbt_ex_ctx_default;
+ __xbt_ex_terminate = &__xbt_ex_terminate_default;
}
-static void * wrapper_start_routine(void *s) {
- xbt_os_thread_t t = s;
+static void *wrapper_start_routine(void *s)
+{
+ xbt_os_thread_t t = s;
int errcode;
- if ((errcode=pthread_setspecific(xbt_self_thread_key,t)))
- THROW0(system_error,errcode,
- "pthread_setspecific failed for xbt_self_thread_key");
-
- return (*(t->start_routine))(t->param);
+ if ((errcode = pthread_setspecific(xbt_self_thread_key, t)))
+ THROW0(system_error, errcode,
+ "pthread_setspecific failed for xbt_self_thread_key");
+
+ return (*(t->start_routine)) (t->param);
}
-xbt_os_thread_t xbt_os_thread_create(const char*name,
- pvoid_f_pvoid_t start_routine,
- void* param) {
- int errcode;
- xbt_os_thread_t res_thread=xbt_new(s_xbt_os_thread_t,1);
- res_thread->name = xbt_strdup(name);
- res_thread->start_routine = start_routine;
- res_thread->param = param;
- res_thread->exception = xbt_new(ex_ctx_t, 1);
- XBT_CTX_INITIALIZE(res_thread->exception);
-
- if ((errcode = pthread_create(&(res_thread->t), NULL,
- wrapper_start_routine, res_thread)))
- THROW1(system_error,errcode,
- "pthread_create failed: %s",strerror(errcode));
+xbt_os_thread_t xbt_os_thread_create(const char *name,
+ pvoid_f_pvoid_t start_routine,
+ void *param)
+{
+ int errcode;
+
+ xbt_os_thread_t res_thread = xbt_new(s_xbt_os_thread_t, 1);
+ res_thread->name = xbt_strdup(name);
+ res_thread->start_routine = start_routine;
+ res_thread->param = param;
+ res_thread->exception = xbt_new(ex_ctx_t, 1);
+ XBT_CTX_INITIALIZE(res_thread->exception);
- return res_thread;
+ if ((errcode = pthread_create(&(res_thread->t), NULL,
+ wrapper_start_routine, res_thread)))
+ THROW1(system_error, errcode,
+ "pthread_create failed: %s", strerror(errcode));
+
+ return res_thread;
}
-const char* xbt_os_thread_name(xbt_os_thread_t t) {
- return t->name;
+const char *xbt_os_thread_name(xbt_os_thread_t t)
+{
+ return t->name;
}
-const char* xbt_os_thread_self_name(void) {
- xbt_os_thread_t self = xbt_os_thread_self();
- return self?self->name:"main";
+const char *xbt_os_thread_self_name(void)
+{
+ xbt_os_thread_t self = xbt_os_thread_self();
+ return self ? self->name : "main";
}
-void
-xbt_os_thread_join(xbt_os_thread_t thread,void ** thread_return) {
-
- int errcode;
-
- if ((errcode = pthread_join(thread->t,thread_return)))
- THROW1(system_error,errcode, "pthread_join failed: %s",
- strerror(errcode));
- if (thread->exception)
- free(thread->exception);
- if (thread == main_thread) /* just killed main thread */
- main_thread = NULL;
+void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
+{
+
+ int errcode;
- free(thread);
-}
+ if ((errcode = pthread_join(thread->t, thread_return)))
+ THROW1(system_error, errcode, "pthread_join failed: %s",
+ strerror(errcode));
+ if (thread->exception)
+ free(thread->exception);
-void xbt_os_thread_exit(int *retval) {
- pthread_exit(retval);
+ if (thread->name)
+ free(thread->name);
+
+ if (thread == main_thread) /* just killed main thread */
+ main_thread = NULL;
+
+ free(thread);
+}
+
+void xbt_os_thread_exit(int *retval)
+{
+ pthread_exit(retval);
}
-xbt_os_thread_t xbt_os_thread_self(void) {
+xbt_os_thread_t xbt_os_thread_self(void)
+{
xbt_os_thread_t res;
if (!thread_mod_inited)
return NULL;
-
+
res = pthread_getspecific(xbt_self_thread_key);
if (!res)
res = main_thread;
}
#include <sched.h>
-void xbt_os_thread_yield(void) {
- sched_yield();
+void xbt_os_thread_yield(void)
+{
+ sched_yield();
}
-void xbt_os_thread_cancel(xbt_os_thread_t t) {
- pthread_cancel(t->t);
+
+void xbt_os_thread_cancel(xbt_os_thread_t t)
+{
+ pthread_cancel(t->t);
}
+
/****** mutex related functions ******/
typedef struct xbt_os_mutex_ {
/* KEEP IT IN SYNC WITH xbt_thread.c */
- pthread_mutex_t m;
+ pthread_mutex_t m;
} s_xbt_os_mutex_t;
-xbt_os_mutex_t xbt_os_mutex_init(void) {
- xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t,1);
- int errcode;
-
- if ((errcode = pthread_mutex_init(&(res->m),NULL)))
- THROW1(system_error,errcode,"pthread_mutex_init() failed: %s",
- strerror(errcode));
-
- return res;
+#include <time.h>
+#include <math.h>
+
+xbt_os_mutex_t xbt_os_mutex_init(void)
+{
+ xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
+ int errcode;
+
+ if ((errcode = pthread_mutex_init(&(res->m), NULL)))
+ THROW1(system_error, errcode, "pthread_mutex_init() failed: %s",
+ strerror(errcode));
+
+ return res;
}
-void xbt_os_mutex_acquire(xbt_os_mutex_t mutex) {
- int errcode;
-
- if ((errcode=pthread_mutex_lock(&(mutex->m))))
- THROW2(system_error,errcode,"pthread_mutex_lock(%p) failed: %s",
- mutex, strerror(errcode));
+void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
+{
+ int errcode;
+
+ if ((errcode = pthread_mutex_lock(&(mutex->m))))
+ THROW2(system_error, errcode, "pthread_mutex_lock(%p) failed: %s",
+ mutex, strerror(errcode));
}
-void xbt_os_mutex_release(xbt_os_mutex_t mutex) {
- int errcode;
-
- if ((errcode=pthread_mutex_unlock(&(mutex->m))))
- THROW2(system_error,errcode,"pthread_mutex_unlock(%p) failed: %s",
- mutex, strerror(errcode));
+
+void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay)
+{
+ int errcode;
+
+ if (delay < 0) {
+ xbt_os_mutex_acquire(mutex);
+
+ } else if (delay == 0) {
+ errcode = pthread_mutex_trylock(&(mutex->m));
+
+ switch (errcode) {
+ case 0:
+ return;
+ case ETIMEDOUT:
+ THROW1(timeout_error, 0, "mutex %p not ready", mutex);
+ default:
+ THROW2(system_error, errcode, "xbt_mutex_timedacquire(%p) failed: %s",
+ mutex, strerror(errcode));
+ }
+
+
+ } else {
+
+#ifdef HAVE_MUTEX_TIMEDLOCK
+ struct timespec ts_end;
+ double end = delay + xbt_os_time();
+
+ ts_end.tv_sec = (time_t) floor(end);
+ ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
+ DEBUG2("pthread_mutex_timedlock(%p,%p)", &(mutex->m), &ts_end);
+
+ errcode = pthread_mutex_timedlock(&(mutex->m), &ts_end);
+
+#else /* Well, let's reimplement it since those lazy libc dudes didn't */
+ double start = xbt_os_time();
+ do {
+ errcode = pthread_mutex_trylock(&(mutex->m));
+ if (errcode == EBUSY)
+ xbt_os_thread_yield();
+ } while (errcode == EBUSY && xbt_os_time() - start < delay);
+
+ if (errcode == EBUSY)
+ errcode = ETIMEDOUT;
+
+#endif /* HAVE_MUTEX_TIMEDLOCK */
+
+ switch (errcode) {
+ case 0:
+ return;
+
+ case ETIMEDOUT:
+ THROW2(timeout_error, delay,
+ "mutex %p wasn't signaled before timeout (%f)", mutex, delay);
+
+ default:
+ THROW3(system_error, errcode,
+ "pthread_mutex_timedlock(%p,%f) failed: %s", mutex, delay,
+ strerror(errcode));
+ }
+ }
+}
+
+void xbt_os_mutex_release(xbt_os_mutex_t mutex)
+{
+ int errcode;
+
+ if ((errcode = pthread_mutex_unlock(&(mutex->m))))
+ THROW2(system_error, errcode, "pthread_mutex_unlock(%p) failed: %s",
+ mutex, strerror(errcode));
}
-void xbt_os_mutex_destroy(xbt_os_mutex_t mutex) {
- int errcode;
-
- if (!mutex) return;
-
- if ((errcode=pthread_mutex_destroy(&(mutex->m))))
- THROW2(system_error,errcode,"pthread_mutex_destroy(%p) failed: %s",
- mutex, strerror(errcode));
- free(mutex);
+void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
+{
+ int errcode;
+
+ if (!mutex)
+ return;
+
+ if ((errcode = pthread_mutex_destroy(&(mutex->m))))
+ THROW2(system_error, errcode, "pthread_mutex_destroy(%p) failed: %s",
+ mutex, strerror(errcode));
+ free(mutex);
}
/***** condition related functions *****/
typedef struct xbt_os_cond_ {
/* KEEP IT IN SYNC WITH xbt_thread.c */
- pthread_cond_t c;
+ pthread_cond_t c;
} s_xbt_os_cond_t;
-xbt_os_cond_t xbt_os_cond_init(void) {
- xbt_os_cond_t res = xbt_new(s_xbt_os_cond_t,1);
- int errcode;
- if ((errcode=pthread_cond_init(&(res->c),NULL)))
- THROW1(system_error,errcode,"pthread_cond_init() failed: %s",
- strerror(errcode));
+xbt_os_cond_t xbt_os_cond_init(void)
+{
+ xbt_os_cond_t res = xbt_new(s_xbt_os_cond_t, 1);
+ int errcode;
+ if ((errcode = pthread_cond_init(&(res->c), NULL)))
+ THROW1(system_error, errcode, "pthread_cond_init() failed: %s",
+ strerror(errcode));
- return res;
+ return res;
}
-void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex) {
- int errcode;
- if ((errcode=pthread_cond_wait(&(cond->c),&(mutex->m))))
- THROW3(system_error,errcode,"pthread_cond_wait(%p,%p) failed: %s",
- cond,mutex, strerror(errcode));
+void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex)
+{
+ int errcode;
+ if ((errcode = pthread_cond_wait(&(cond->c), &(mutex->m))))
+ THROW3(system_error, errcode, "pthread_cond_wait(%p,%p) failed: %s",
+ cond, mutex, strerror(errcode));
}
-#include <time.h>
-#include <math.h>
-void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex, double delay) {
- int errcode;
- struct timespec ts_end;
- double end = delay + xbt_os_time();
-
- if (delay < 0) {
- xbt_os_cond_wait(cond,mutex);
- } else {
- ts_end.tv_sec = (time_t) floor(end);
- ts_end.tv_nsec = (long) ( ( end - ts_end.tv_sec) * 1000000000);
- DEBUG3("pthread_cond_timedwait(%p,%p,%p)",&(cond->c),&(mutex->m), &ts_end);
- switch ( (errcode=pthread_cond_timedwait(&(cond->c),&(mutex->m), &ts_end)) ) {
- case 0:
- return;
- case ETIMEDOUT:
- THROW3(timeout_error,errcode,"condition %p (mutex %p) wasn't signaled before timeout (%f)",
- cond,mutex, delay);
- default:
- THROW4(system_error,errcode,"pthread_cond_timedwait(%p,%p,%f) failed: %s",
- cond,mutex, delay, strerror(errcode));
- }
- }
-}
-
-void xbt_os_cond_signal(xbt_os_cond_t cond) {
- int errcode;
- if ((errcode=pthread_cond_signal(&(cond->c))))
- THROW2(system_error,errcode,"pthread_cond_signal(%p) failed: %s",
- cond, strerror(errcode));
-}
-
-void xbt_os_cond_broadcast(xbt_os_cond_t cond){
- int errcode;
- if ((errcode=pthread_cond_broadcast(&(cond->c))))
- THROW2(system_error,errcode,"pthread_cond_broadcast(%p) failed: %s",
- cond, strerror(errcode));
-}
-void xbt_os_cond_destroy(xbt_os_cond_t cond){
- int errcode;
-
- if (!cond) return;
-
- if ((errcode=pthread_cond_destroy(&(cond->c))))
- THROW2(system_error,errcode,"pthread_cond_destroy(%p) failed: %s",
- cond, strerror(errcode));
- free(cond);
-}
-
-void *xbt_os_thread_getparam(void) {
- xbt_os_thread_t t = xbt_os_thread_self();
- return t?t->param:NULL;
+
+void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex,
+ double delay)
+{
+ int errcode;
+ struct timespec ts_end;
+ double end = delay + xbt_os_time();
+
+ if (delay < 0) {
+ xbt_os_cond_wait(cond, mutex);
+ } else {
+ ts_end.tv_sec = (time_t) floor(end);
+ ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
+ DEBUG3("pthread_cond_timedwait(%p,%p,%p)", &(cond->c), &(mutex->m),
+ &ts_end);
+ switch ((errcode =
+ pthread_cond_timedwait(&(cond->c), &(mutex->m), &ts_end))) {
+ case 0:
+ return;
+ case ETIMEDOUT:
+ THROW3(timeout_error, errcode,
+ "condition %p (mutex %p) wasn't signaled before timeout (%f)",
+ cond, mutex, delay);
+ default:
+ THROW4(system_error, errcode,
+ "pthread_cond_timedwait(%p,%p,%f) failed: %s", cond, mutex,
+ delay, strerror(errcode));
+ }
+ }
+}
+
+void xbt_os_cond_signal(xbt_os_cond_t cond)
+{
+ int errcode;
+ if ((errcode = pthread_cond_signal(&(cond->c))))
+ THROW2(system_error, errcode, "pthread_cond_signal(%p) failed: %s",
+ cond, strerror(errcode));
+}
+
+void xbt_os_cond_broadcast(xbt_os_cond_t cond)
+{
+ int errcode;
+ if ((errcode = pthread_cond_broadcast(&(cond->c))))
+ THROW2(system_error, errcode, "pthread_cond_broadcast(%p) failed: %s",
+ cond, strerror(errcode));
+}
+
+void xbt_os_cond_destroy(xbt_os_cond_t cond)
+{
+ int errcode;
+
+ if (!cond)
+ return;
+
+ if ((errcode = pthread_cond_destroy(&(cond->c))))
+ THROW2(system_error, errcode, "pthread_cond_destroy(%p) failed: %s",
+ cond, strerror(errcode));
+ free(cond);
+}
+
+void *xbt_os_thread_getparam(void)
+{
+ xbt_os_thread_t t = xbt_os_thread_self();
+ return t ? t->param : NULL;
}
typedef struct xbt_os_sem_ {
- sem_t s;
-}s_xbt_os_sem_t ;
-
-xbt_os_sem_t
-xbt_os_sem_init(unsigned int value)
-{
- xbt_os_sem_t res = xbt_new(s_xbt_os_sem_t,1);
-
- if(sem_init(&(res->s),0,value) < 0)
- THROW1(system_error,errno,"sem_init() failed: %s",
- strerror(errno));
-
- return res;
-}
-
-void
-xbt_os_sem_acquire(xbt_os_sem_t sem)
-{
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_acquire() failed: %s",
- strerror(EINVAL));
-
- if(sem_wait(&(sem->s)) < 0)
- THROW1(system_error,errno,"sem_wait() failed: %s",
- strerror(errno));
-}
-
-void xbt_os_sem_timedacquire(xbt_os_sem_t sem,double timeout)
-{
- /* mac os x have not the sem_timedwait() function */
- #ifndef HAVE_SEM_TIMEDWAIT
- THROW_UNIMPLEMENTED;
- #else
- int errcode;
- struct timespec ts_end;
- double end = timeout + xbt_os_time();
-
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_timedacquire() failed: %s",strerror(EINVAL));
-
- if (timeout < 0)
- {
- xbt_os_sem_acquire(sem);
- }
- else
- {
- ts_end.tv_sec = (time_t) floor(end);
- ts_end.tv_nsec = (long) ( ( end - ts_end.tv_sec) * 1000000000);
- DEBUG2("sem_timedwait(%p,%p)",&(sem->s),&ts_end);
-
- switch ((errcode=sem_timedwait(&(sem->s),&ts_end)))
- {
- case 0:
- return;
-
- case ETIMEDOUT:
- THROW2(timeout_error,errcode,"semaphore %p wasn't signaled before timeout (%f)",sem,timeout);
-
- default:
- THROW3(system_error,errcode,"sem_timedwait(%p,%f) failed: %s",sem,timeout, strerror(errcode));
- }
- }
- #endif
-}
-
-void
-xbt_os_sem_release(xbt_os_sem_t sem)
-{
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_release() failed: %s",
- strerror(EINVAL));
-
- if(sem_post(&(sem->s)) < 0)
- THROW1(system_error,errno,"sem_post() failed: %s",
- strerror(errno));
-}
-
-void
-xbt_os_sem_destroy(xbt_os_sem_t sem)
-{
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_destroy() failed: %s",
- strerror(EINVAL));
-
- if(sem_destroy(&(sem->s)) < 0)
- THROW1(system_error,errno,"sem_destroy() failed: %s",
- strerror(errno));
-}
-
-void
-xbt_os_sem_get_value(xbt_os_sem_t sem, int* svalue)
-{
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_getvalue() failed: %s",
- strerror(EINVAL));
-
- if(sem_getvalue(&(sem->s),svalue) < 0)
- THROW1(system_error,errno,"sem_getvalue() failed: %s",
- strerror(errno));
+#ifndef HAVE_SEM_INIT
+ char *name;
+#endif
+ sem_t s;
+ sem_t *ps;
+} s_xbt_os_sem_t;
+
+#ifndef SEM_FAILED
+#define SEM_FAILED (-1)
+#endif
+
+xbt_os_sem_t xbt_os_sem_init(unsigned int value)
+{
+ xbt_os_sem_t res = xbt_new(s_xbt_os_sem_t, 1);
+
+ /* On some systems (MAC OS X), only the stub of sem_init is to be found.
+ * Any attempt to use it leads to ENOSYS (function not implemented).
+ * If such a prehistoric system is detected, do the job with sem_open instead
+ */
+#ifdef HAVE_SEM_INIT
+ if (sem_init(&(res->s), 0, value) != 0)
+ THROW1(system_error, errno, "sem_init() failed: %s", strerror(errno));
+ res->ps = &(res->s);
+
+#else /* damn, no sem_init(). Reimplement it */
+
+ xbt_os_mutex_acquire(next_sem_ID_lock);
+ res->name = bprintf("/%d.%d", (*xbt_getpid) (), ++next_sem_ID);
+ xbt_os_mutex_release(next_sem_ID_lock);
+
+ res->ps = sem_open(res->name, O_CREAT, 0644, value);
+ if ((res->ps == (sem_t *) SEM_FAILED) && (errno == ENAMETOOLONG)) {
+ /* Old darwins only allow 13 chars. Did you create *that* amount of semaphores? */
+ res->name[13] = '\0';
+ res->ps = sem_open(res->name, O_CREAT, 0644, 1);
+ }
+ if ((res->ps == (sem_t *) SEM_FAILED))
+ THROW1(system_error, errno, "sem_open() failed: %s", strerror(errno));
+
+ /* Remove the name from the semaphore namespace: we never join on it */
+ if (sem_unlink(res->name) < 0)
+ THROW1(system_error, errno, "sem_unlink() failed: %s", strerror(errno));
+
+#endif
+
+ return res;
+}
+
+void xbt_os_sem_acquire(xbt_os_sem_t sem)
+{
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot acquire of the NULL semaphore");
+ if (sem_wait(sem->ps) < 0)
+ THROW1(system_error, errno, "sem_wait() failed: %s", strerror(errno));
+}
+
+void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double delay)
+{
+ int errcode;
+
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot acquire of the NULL semaphore");
+
+ if (delay < 0) {
+ xbt_os_sem_acquire(sem);
+ } else if (delay == 0) {
+ errcode = sem_trywait(sem->ps);
+
+ switch (errcode) {
+ case 0:
+ return;
+ case ETIMEDOUT:
+ THROW1(timeout_error, 0, "semaphore %p not ready", sem);
+ default:
+ THROW2(system_error, errcode, "xbt_os_sem_timedacquire(%p) failed: %s",
+ sem, strerror(errcode));
+ }
+
+ } else {
+#ifdef HAVE_SEM_WAIT
+ struct timespec ts_end;
+ double end = delay + xbt_os_time();
+
+ ts_end.tv_sec = (time_t) floor(end);
+ ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
+ DEBUG2("sem_timedwait(%p,%p)", sem->ps, &ts_end);
+ errcode = sem_timedwait(sem->s, &ts_end);
+
+#else /* Okay, reimplement this function then */
+ double start = xbt_os_time();
+ do {
+ errcode = sem_trywait(sem->ps);
+ if (errcode == EBUSY)
+ xbt_os_thread_yield();
+ } while (errcode == EBUSY && xbt_os_time() - start < delay);
+
+ if (errcode == EBUSY)
+ errcode = ETIMEDOUT;
+#endif
+
+ switch (errcode) {
+ case 0:
+ return;
+
+ case ETIMEDOUT:
+ THROW2(timeout_error, delay,
+ "semaphore %p wasn't signaled before timeout (%f)", sem, delay);
+
+ default:
+ THROW3(system_error, errcode, "sem_timedwait(%p,%f) failed: %s", sem,
+ delay, strerror(errcode));
+ }
+ }
+}
+
+void xbt_os_sem_release(xbt_os_sem_t sem)
+{
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot release of the NULL semaphore");
+
+ if (sem_post(sem->ps) < 0)
+ THROW1(system_error, errno, "sem_post() failed: %s", strerror(errno));
+}
+
+void xbt_os_sem_destroy(xbt_os_sem_t sem)
+{
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot destroy the NULL sempahore");
+
+#ifdef HAVE_SEM_INIT
+ if (sem_destroy(sem->ps))
+ <0)
+ THROW1(system_error, errno, "sem_destroy() failed: %s",
+ strerror(errno));
+#else
+ if (sem_close(sem->ps) < 0)
+ THROW1(system_error, errno, "sem_close() failed: %s", strerror(errno));
+ xbt_free(sem->name);
+
+#endif
+ xbt_free(sem);
+}
+
+void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
+{
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot get the value of the NULL semaphore");
+
+ if (sem_getvalue(&(sem->s), svalue) < 0)
+ THROW1(system_error, errno, "sem_getvalue() failed: %s", strerror(errno));
}
/* ********************************* WINDOWS IMPLEMENTATION ************************************ */
typedef struct xbt_os_thread_ {
char *name;
- HANDLE handle; /* the win thread handle */
- unsigned long id; /* the win thread id */
+ HANDLE handle; /* the win thread handle */
+ unsigned long id; /* the win thread id */
pvoid_f_pvoid_t start_routine;
- void* param;
-} s_xbt_os_thread_t ;
+ void *param;
+} s_xbt_os_thread_t;
/* so we can specify the size of the stack of the threads */
#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
/* key to the TLS containing the xbt_os_thread_t structure */
static unsigned long xbt_self_thread_key;
-void xbt_os_thread_mod_init(void) {
- xbt_self_thread_key = TlsAlloc();
+void xbt_os_thread_mod_init(void)
+{
+ xbt_self_thread_key = TlsAlloc();
}
-void xbt_os_thread_mod_exit(void) {
-
- if (!TlsFree(xbt_self_thread_key))
- THROW0(system_error,(int)GetLastError(),"TlsFree() failed to cleanup the thread submodule");
+
+void xbt_os_thread_mod_exit(void)
+{
+
+ if (!TlsFree(xbt_self_thread_key))
+ THROW0(system_error, (int) GetLastError(),
+ "TlsFree() failed to cleanup the thread submodule");
}
-static DWORD WINAPI wrapper_start_routine(void *s) {
- xbt_os_thread_t t = (xbt_os_thread_t)s;
- void* rv;
-
- if(!TlsSetValue(xbt_self_thread_key,t))
- THROW0(system_error,(int)GetLastError(),"TlsSetValue of data describing the created thread failed");
-
- rv = (*(t->start_routine))(t->param);
+static DWORD WINAPI wrapper_start_routine(void *s)
+{
+ xbt_os_thread_t t = (xbt_os_thread_t) s;
+ DWORD *rv;
+
+ if (!TlsSetValue(xbt_self_thread_key, t))
+ THROW0(system_error, (int) GetLastError(),
+ "TlsSetValue of data describing the created thread failed");
+
+ rv = (DWORD *) ((t->start_routine) (t->param));
+
+ return rv ? *rv : 0;
- return *((DWORD*)rv);
}
-xbt_os_thread_t xbt_os_thread_create(const char *name,pvoid_f_pvoid_t start_routine,
- void* param) {
-
- xbt_os_thread_t t = xbt_new(s_xbt_os_thread_t,1);
+xbt_os_thread_t xbt_os_thread_create(const char *name,
+ pvoid_f_pvoid_t start_routine,
+ void *param)
+{
+
+ xbt_os_thread_t t = xbt_new(s_xbt_os_thread_t, 1);
+
+ t->name = xbt_strdup(name);
+ t->start_routine = start_routine;
+ t->param = param;
- t->name = xbt_strdup(name);
- t->start_routine = start_routine ;
- t->param = param;
-
- t->handle = CreateThread(NULL,XBT_DEFAULT_THREAD_STACK_SIZE,
- (LPTHREAD_START_ROUTINE)wrapper_start_routine,
- t,STACK_SIZE_PARAM_IS_A_RESERVATION,&(t->id));
-
- if(!t->handle) {
- xbt_free(t);
- THROW0(system_error,(int)GetLastError(),"CreateThread failed");
- }
-
- return t;
+ t->handle = CreateThread(NULL, XBT_DEFAULT_THREAD_STACK_SIZE,
+ (LPTHREAD_START_ROUTINE) wrapper_start_routine,
+ t, STACK_SIZE_PARAM_IS_A_RESERVATION, &(t->id));
+
+ if (!t->handle) {
+ xbt_free(t);
+ THROW0(system_error, (int) GetLastError(), "CreateThread failed");
+ }
+
+ return t;
}
-const char* xbt_os_thread_name(xbt_os_thread_t t) {
- return t->name;
+const char *xbt_os_thread_name(xbt_os_thread_t t)
+{
+ return t->name;
}
-const char* xbt_os_thread_self_name(void) {
- xbt_os_thread_t t = xbt_os_thread_self();
- return t?t->name:"main";
+const char *xbt_os_thread_self_name(void)
+{
+ xbt_os_thread_t t = xbt_os_thread_self();
+ return t ? t->name : "main";
}
-void
-xbt_os_thread_join(xbt_os_thread_t thread,void ** thread_return) {
+void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
+{
+
+ if (WAIT_OBJECT_0 != WaitForSingleObject(thread->handle, INFINITE))
+ THROW0(system_error, (int) GetLastError(), "WaitForSingleObject failed");
+
+ if (thread_return) {
+
+ if (!GetExitCodeThread(thread->handle, (DWORD *) (*thread_return)))
+ THROW0(system_error, (int) GetLastError(), "GetExitCodeThread failed");
+ }
- if(WAIT_OBJECT_0 != WaitForSingleObject(thread->handle,INFINITE))
- THROW0(system_error,(int)GetLastError(), "WaitForSingleObject failed");
-
- if(thread_return){
-
- if(!GetExitCodeThread(thread->handle,(DWORD*)(*thread_return)))
- THROW0(system_error,(int)GetLastError(), "GetExitCodeThread failed");
- }
-
- CloseHandle(thread->handle);
- free(thread->name);
- free(thread);
+ CloseHandle(thread->handle);
+
+ if (thread->name)
+ free(thread->name);
+
+ free(thread);
}
-void xbt_os_thread_exit(int *retval) {
- if(retval)
- ExitThread(*retval);
- else
- ExitThread(0);
+void xbt_os_thread_exit(int *retval)
+{
+ if (retval)
+ ExitThread(*retval);
+ else
+ ExitThread(0);
}
-xbt_os_thread_t xbt_os_thread_self(void) {
- return TlsGetValue(xbt_self_thread_key);
+xbt_os_thread_t xbt_os_thread_self(void)
+{
+ return TlsGetValue(xbt_self_thread_key);
}
-void *xbt_os_thread_getparam(void) {
- xbt_os_thread_t t = xbt_os_thread_self();
- return t->param;
+void *xbt_os_thread_getparam(void)
+{
+ xbt_os_thread_t t = xbt_os_thread_self();
+ return t->param;
}
-void xbt_os_thread_yield(void) {
- Sleep(0);
+void xbt_os_thread_yield(void)
+{
+ Sleep(0);
}
-void xbt_os_thread_cancel(xbt_os_thread_t t) {
- THROW_UNIMPLEMENTED;
+
+void xbt_os_thread_cancel(xbt_os_thread_t t)
+{
+ if (!TerminateThread(t->handle, 0))
+ THROW0(system_error, (int) GetLastError(), "TerminateThread failed");
}
/****** mutex related functions ******/
typedef struct xbt_os_mutex_ {
/* KEEP IT IN SYNC WITH xbt_thread.c */
- CRITICAL_SECTION lock;
+ CRITICAL_SECTION lock;
} s_xbt_os_mutex_t;
-xbt_os_mutex_t xbt_os_mutex_init(void) {
- xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t,1);
+xbt_os_mutex_t xbt_os_mutex_init(void)
+{
+ xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
+
+ /* initialize the critical section object */
+ InitializeCriticalSection(&(res->lock));
- /* initialize the critical section object */
- InitializeCriticalSection(&(res->lock));
-
- return res;
+ return res;
}
-void xbt_os_mutex_acquire(xbt_os_mutex_t mutex) {
+void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
+{
+ EnterCriticalSection(&mutex->lock);
+}
- EnterCriticalSection(& mutex->lock);
+void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay)
+{
+ THROW_UNIMPLEMENTED;
}
-void xbt_os_mutex_release(xbt_os_mutex_t mutex) {
+void xbt_os_mutex_release(xbt_os_mutex_t mutex)
+{
- LeaveCriticalSection (& mutex->lock);
+ LeaveCriticalSection(&mutex->lock);
}
-void xbt_os_mutex_destroy(xbt_os_mutex_t mutex) {
+void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
+{
+
+ if (!mutex)
+ return;
- if (!mutex) return;
-
- DeleteCriticalSection(& mutex->lock);
- free(mutex);
+ DeleteCriticalSection(&mutex->lock);
+ free(mutex);
}
/***** condition related functions *****/
- enum { /* KEEP IT IN SYNC WITH xbt_thread.c */
- SIGNAL = 0,
- BROADCAST = 1,
- MAX_EVENTS = 2
- };
+enum { /* KEEP IT IN SYNC WITH xbt_thread.c */
+ SIGNAL = 0,
+ BROADCAST = 1,
+ MAX_EVENTS = 2
+};
typedef struct xbt_os_cond_ {
/* KEEP IT IN SYNC WITH xbt_thread.c */
- HANDLE events[MAX_EVENTS];
-
- unsigned int waiters_count; /* the number of waiters */
- CRITICAL_SECTION waiters_count_lock; /* protect access to waiters_count */
+ HANDLE events[MAX_EVENTS];
+
+ unsigned int waiters_count; /* the number of waiters */
+ CRITICAL_SECTION waiters_count_lock; /* protect access to waiters_count */
} s_xbt_os_cond_t;
-xbt_os_cond_t xbt_os_cond_init(void) {
-
- xbt_os_cond_t res = xbt_new0(s_xbt_os_cond_t,1);
-
- memset(& res->waiters_count_lock,0,sizeof(CRITICAL_SECTION));
-
- /* initialize the critical section object */
- InitializeCriticalSection(& res->waiters_count_lock);
-
- res->waiters_count = 0;
-
- /* Create an auto-reset event */
- res->events[SIGNAL] = CreateEvent (NULL, FALSE, FALSE, NULL);
-
- if(!res->events[SIGNAL]){
- DeleteCriticalSection(& res->waiters_count_lock);
- free(res);
- THROW0(system_error,0,"CreateEvent failed for the signals");
- }
-
- /* Create a manual-reset event. */
- res->events[BROADCAST] = CreateEvent (NULL, TRUE, FALSE,NULL);
-
- if(!res->events[BROADCAST]){
-
- DeleteCriticalSection(& res->waiters_count_lock);
- CloseHandle(res->events[SIGNAL]);
- free(res);
- THROW0(system_error,0,"CreateEvent failed for the broadcasts");
- }
-
- return res;
-}
-
-void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex) {
-
- unsigned long wait_result;
- int is_last_waiter;
-
- /* lock the threads counter and increment it */
- EnterCriticalSection (& cond->waiters_count_lock);
- cond->waiters_count++;
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- /* unlock the mutex associate with the condition */
- LeaveCriticalSection (& mutex->lock);
-
- /* wait for a signal (broadcast or no) */
- wait_result = WaitForMultipleObjects (2, cond->events, FALSE, INFINITE);
-
- if(wait_result == WAIT_FAILED)
- THROW0(system_error,0,"WaitForMultipleObjects failed, so we cannot wait on the condition");
-
- /* we have a signal lock the condition */
- EnterCriticalSection (& cond->waiters_count_lock);
- cond->waiters_count--;
-
- /* it's the last waiter or it's a broadcast ? */
- is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1) && (cond->waiters_count == 0));
-
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- /* yes it's the last waiter or it's a broadcast
- * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
- * by the system.
- */
- if (is_last_waiter)
- if(!ResetEvent (cond->events[BROADCAST]))
- THROW0(system_error,0,"ResetEvent failed");
-
- /* relock the mutex associated with the condition in accordance with the posix thread specification */
- EnterCriticalSection (& mutex->lock);
-}
-void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex, double delay) {
-
- unsigned long wait_result = WAIT_TIMEOUT;
- int is_last_waiter;
- unsigned long end = (unsigned long)(delay * 1000);
-
-
- if (delay < 0) {
- xbt_os_cond_wait(cond,mutex);
- } else {
- DEBUG3("xbt_cond_timedwait(%p,%p,%ul)",&(cond->events),&(mutex->lock),end);
-
- /* lock the threads counter and increment it */
- EnterCriticalSection (& cond->waiters_count_lock);
- cond->waiters_count++;
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- /* unlock the mutex associate with the condition */
- LeaveCriticalSection (& mutex->lock);
- /* wait for a signal (broadcast or no) */
-
- wait_result = WaitForMultipleObjects (2, cond->events, FALSE, end);
-
- switch(wait_result) {
- case WAIT_TIMEOUT:
- THROW3(timeout_error,GetLastError(),"condition %p (mutex %p) wasn't signaled before timeout (%f)",cond,mutex, delay);
- case WAIT_FAILED:
- THROW0(system_error,GetLastError(),"WaitForMultipleObjects failed, so we cannot wait on the condition");
- }
-
- /* we have a signal lock the condition */
- EnterCriticalSection (& cond->waiters_count_lock);
- cond->waiters_count--;
-
- /* it's the last waiter or it's a broadcast ? */
- is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1) && (cond->waiters_count == 0));
-
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- /* yes it's the last waiter or it's a broadcast
- * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
- * by the system.
- */
- if (is_last_waiter)
- if(!ResetEvent (cond->events[BROADCAST]))
- THROW0(system_error,0,"ResetEvent failed");
-
- /* relock the mutex associated with the condition in accordance with the posix thread specification */
- EnterCriticalSection (& mutex->lock);
- }
- /*THROW_UNIMPLEMENTED;*/
-}
-
-void xbt_os_cond_signal(xbt_os_cond_t cond) {
- int have_waiters;
-
- EnterCriticalSection (& cond->waiters_count_lock);
- have_waiters = cond->waiters_count > 0;
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- if (have_waiters)
- if(!SetEvent(cond->events[SIGNAL]))
- THROW0(system_error,0,"SetEvent failed");
-
- xbt_os_thread_yield();
-}
-
-void xbt_os_cond_broadcast(xbt_os_cond_t cond){
- int have_waiters;
-
- EnterCriticalSection (& cond->waiters_count_lock);
- have_waiters = cond->waiters_count > 0;
- LeaveCriticalSection (& cond->waiters_count_lock);
-
- if (have_waiters)
- SetEvent(cond->events[BROADCAST]);
-}
-
-void xbt_os_cond_destroy(xbt_os_cond_t cond){
- int error = 0;
-
- if (!cond) return;
-
- if(!CloseHandle(cond->events[SIGNAL]))
- error = 1;
-
- if(!CloseHandle(cond->events[BROADCAST]))
- error = 1;
-
- DeleteCriticalSection(& cond->waiters_count_lock);
-
- xbt_free(cond);
-
- if (error)
- THROW0(system_error,0,"Error while destroying the condition");
+xbt_os_cond_t xbt_os_cond_init(void)
+{
+
+ xbt_os_cond_t res = xbt_new0(s_xbt_os_cond_t, 1);
+
+ memset(&res->waiters_count_lock, 0, sizeof(CRITICAL_SECTION));
+
+ /* initialize the critical section object */
+ InitializeCriticalSection(&res->waiters_count_lock);
+
+ res->waiters_count = 0;
+
+ /* Create an auto-reset event */
+ res->events[SIGNAL] = CreateEvent(NULL, FALSE, FALSE, NULL);
+
+ if (!res->events[SIGNAL]) {
+ DeleteCriticalSection(&res->waiters_count_lock);
+ free(res);
+ THROW0(system_error, 0, "CreateEvent failed for the signals");
+ }
+
+ /* Create a manual-reset event. */
+ res->events[BROADCAST] = CreateEvent(NULL, TRUE, FALSE, NULL);
+
+ if (!res->events[BROADCAST]) {
+
+ DeleteCriticalSection(&res->waiters_count_lock);
+ CloseHandle(res->events[SIGNAL]);
+ free(res);
+ THROW0(system_error, 0, "CreateEvent failed for the broadcasts");
+ }
+
+ return res;
+}
+
+void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex)
+{
+
+ unsigned long wait_result;
+ int is_last_waiter;
+
+ /* lock the threads counter and increment it */
+ EnterCriticalSection(&cond->waiters_count_lock);
+ cond->waiters_count++;
+ LeaveCriticalSection(&cond->waiters_count_lock);
+
+ /* unlock the mutex associate with the condition */
+ LeaveCriticalSection(&mutex->lock);
+
+ /* wait for a signal (broadcast or no) */
+ wait_result = WaitForMultipleObjects(2, cond->events, FALSE, INFINITE);
+
+ if (wait_result == WAIT_FAILED)
+ THROW0(system_error, 0,
+ "WaitForMultipleObjects failed, so we cannot wait on the condition");
+
+ /* we have a signal lock the condition */
+ EnterCriticalSection(&cond->waiters_count_lock);
+ cond->waiters_count--;
+
+ /* it's the last waiter or it's a broadcast ? */
+ is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1)
+ && (cond->waiters_count == 0));
+
+ LeaveCriticalSection(&cond->waiters_count_lock);
+
+ /* yes it's the last waiter or it's a broadcast
+ * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
+ * by the system.
+ */
+ if (is_last_waiter)
+ if (!ResetEvent(cond->events[BROADCAST]))
+ THROW0(system_error, 0, "ResetEvent failed");
+
+ /* relock the mutex associated with the condition in accordance with the posix thread specification */
+ EnterCriticalSection(&mutex->lock);
+}
+
+void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex,
+ double delay)
+{
+
+ unsigned long wait_result = WAIT_TIMEOUT;
+ int is_last_waiter;
+ unsigned long end = (unsigned long) (delay * 1000);
+
+
+ if (delay < 0) {
+ xbt_os_cond_wait(cond, mutex);
+ } else {
+ DEBUG3("xbt_cond_timedwait(%p,%p,%lu)", &(cond->events), &(mutex->lock),
+ end);
+
+ /* lock the threads counter and increment it */
+ EnterCriticalSection(&cond->waiters_count_lock);
+ cond->waiters_count++;
+ LeaveCriticalSection(&cond->waiters_count_lock);
+
+ /* unlock the mutex associate with the condition */
+ LeaveCriticalSection(&mutex->lock);
+ /* wait for a signal (broadcast or no) */
+
+ wait_result = WaitForMultipleObjects(2, cond->events, FALSE, end);
+
+ switch (wait_result) {
+ case WAIT_TIMEOUT:
+ THROW3(timeout_error, GetLastError(),
+ "condition %p (mutex %p) wasn't signaled before timeout (%f)",
+ cond, mutex, delay);
+ case WAIT_FAILED:
+ THROW0(system_error, GetLastError(),
+ "WaitForMultipleObjects failed, so we cannot wait on the condition");
+ }
+
+ /* we have a signal lock the condition */
+ EnterCriticalSection(&cond->waiters_count_lock);
+ cond->waiters_count--;
+
+ /* it's the last waiter or it's a broadcast ? */
+ is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1)
+ && (cond->waiters_count == 0));
+
+ LeaveCriticalSection(&cond->waiters_count_lock);
+
+ /* yes it's the last waiter or it's a broadcast
+ * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
+ * by the system.
+ */
+ if (is_last_waiter)
+ if (!ResetEvent(cond->events[BROADCAST]))
+ THROW0(system_error, 0, "ResetEvent failed");
+
+ /* relock the mutex associated with the condition in accordance with the posix thread specification */
+ EnterCriticalSection(&mutex->lock);
+ }
+ /*THROW_UNIMPLEMENTED; */
+}
+
+void xbt_os_cond_signal(xbt_os_cond_t cond)
+{
+ int have_waiters;
+
+ EnterCriticalSection(&cond->waiters_count_lock);
+ have_waiters = cond->waiters_count > 0;
+ LeaveCriticalSection(&cond->waiters_count_lock);
+
+ if (have_waiters)
+ if (!SetEvent(cond->events[SIGNAL]))
+ THROW0(system_error, 0, "SetEvent failed");
+
+ xbt_os_thread_yield();
+}
+
+void xbt_os_cond_broadcast(xbt_os_cond_t cond)
+{
+ int have_waiters;
+
+ EnterCriticalSection(&cond->waiters_count_lock);
+ have_waiters = cond->waiters_count > 0;
+ LeaveCriticalSection(&cond->waiters_count_lock);
+
+ if (have_waiters)
+ SetEvent(cond->events[BROADCAST]);
+}
+
+void xbt_os_cond_destroy(xbt_os_cond_t cond)
+{
+ int error = 0;
+
+ if (!cond)
+ return;
+
+ if (!CloseHandle(cond->events[SIGNAL]))
+ error = 1;
+
+ if (!CloseHandle(cond->events[BROADCAST]))
+ error = 1;
+
+ DeleteCriticalSection(&cond->waiters_count_lock);
+
+ xbt_free(cond);
+
+ if (error)
+ THROW0(system_error, 0, "Error while destroying the condition");
}
typedef struct xbt_os_sem_ {
- HANDLE h;
- unsigned int value;
- CRITICAL_SECTION value_lock; /* protect access to value of the semaphore */
-}s_xbt_os_sem_t ;
-
-xbt_os_sem_t
-xbt_os_sem_init(unsigned int value)
-{
- xbt_os_sem_t res;
-
- if(value > INT_MAX)
- THROW1(arg_error,EINVAL,"xbt_os_sem_init() failed: %s",
- strerror(EINVAL));
-
- res = (xbt_os_sem_t)xbt_new0(s_xbt_os_sem_t,1);
-
- if(!(res->h = CreateSemaphore(NULL,value,(long)INT_MAX,NULL))) {
- THROW1(system_error,GetLastError(),"CreateSemaphore() failed: %s",
- strerror(GetLastError()));
- return NULL;
- }
-
- res->value = value;
-
- InitializeCriticalSection(&(res->value_lock));
-
- return res;
-}
-
-void
-xbt_os_sem_acquire(xbt_os_sem_t sem)
-{
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_acquire() failed: %s",
- strerror(EINVAL));
-
- /* wait failure */
- if(WAIT_OBJECT_0 != WaitForSingleObject(sem->h,INFINITE))
- THROW1(system_error,GetLastError(),"WaitForSingleObject() failed: %s",
- strerror(GetLastError()));
- EnterCriticalSection(&(sem->value_lock));
- sem->value--;
- LeaveCriticalSection(&(sem->value_lock));
+ HANDLE h;
+ unsigned int value;
+ CRITICAL_SECTION value_lock; /* protect access to value of the semaphore */
+} s_xbt_os_sem_t;
+
+#ifndef INT_MAX
+# define INT_MAX 32767 /* let's be safe by underestimating this value: this is for 16bits only */
+#endif
+
+xbt_os_sem_t xbt_os_sem_init(unsigned int value)
+{
+ xbt_os_sem_t res;
+
+ if (value > INT_MAX)
+ THROW1(arg_error, value,
+ "Semaphore initial value too big: %ud cannot be stored as a signed int",
+ value);
+
+ res = (xbt_os_sem_t) xbt_new0(s_xbt_os_sem_t, 1);
+
+ if (!(res->h = CreateSemaphore(NULL, value, (long) INT_MAX, NULL))) {
+ THROW1(system_error, GetLastError(), "CreateSemaphore() failed: %s",
+ strerror(GetLastError()));
+ return NULL;
+ }
+
+ res->value = value;
+
+ InitializeCriticalSection(&(res->value_lock));
+
+ return res;
+}
+
+void xbt_os_sem_acquire(xbt_os_sem_t sem)
+{
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot acquire the NULL semaphore");
+
+ /* wait failure */
+ if (WAIT_OBJECT_0 != WaitForSingleObject(sem->h, INFINITE))
+ THROW1(system_error, GetLastError(), "WaitForSingleObject() failed: %s",
+ strerror(GetLastError()));
+ EnterCriticalSection(&(sem->value_lock));
+ sem->value--;
+ LeaveCriticalSection(&(sem->value_lock));
}
void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double timeout)
{
- long seconds;
- long milliseconds;
- double end = timeout + xbt_os_time();
-
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_timedacquire() failed: %s",
- strerror(EINVAL));
-
- if (timeout < 0)
- {
- xbt_os_sem_acquire(sem);
- }
- else
- {
-
- seconds = (long) floor(end);
- milliseconds = (long)( ( end - seconds) * 1000);
- milliseconds += (seconds * 1000);
-
- switch(WaitForSingleObject(sem->h,milliseconds))
- {
- case WAIT_OBJECT_0:
- EnterCriticalSection(&(sem->value_lock));
- sem->value--;
- LeaveCriticalSection(&(sem->value_lock));
- return;
-
- case WAIT_TIMEOUT:
- THROW2(timeout_error,GetLastError(),"semaphore %p wasn't signaled before timeout (%f)",sem,timeout);
- return;
-
- default:
-
- THROW3(system_error,GetLastError(),"WaitForSingleObject(%p,%f) failed: %s",sem,timeout, strerror(GetLastError()));
- }
- }
-}
-
-void
-xbt_os_sem_release(xbt_os_sem_t sem)
-{
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_post() failed: %s",
- strerror(EINVAL));
-
- if(!ReleaseSemaphore(sem->h,1, NULL))
- THROW1(system_error,GetLastError(),"ReleaseSemaphore() failed: %s",
- strerror(GetLastError()));
- EnterCriticalSection (&(sem->value_lock));
- sem->value++;
- LeaveCriticalSection(&(sem->value_lock));
-}
-
-void
-xbt_os_sem_destroy(xbt_os_sem_t sem)
-{
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_destroy() failed: %s",
- strerror(EINVAL));
-
- if(!CloseHandle(sem->h))
- THROW1(system_error,GetLastError(),"CloseHandle() failed: %s",
- strerror(GetLastError()));
-
- DeleteCriticalSection(&(sem->value_lock));
-
- xbt_free(sem);
-
-}
-
-void
-xbt_os_sem_get_value(xbt_os_sem_t sem, int* svalue)
-{
- if(!sem)
- THROW1(arg_error,EINVAL,"xbt_os_sem_get_value() failed: %s",
- strerror(EINVAL));
-
- EnterCriticalSection(&(sem->value_lock));
- *svalue = sem->value;
- LeaveCriticalSection(&(sem->value_lock));
+ long seconds;
+ long milliseconds;
+ double end = timeout + xbt_os_time();
+
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot acquire the NULL semaphore");
+
+ if (timeout < 0) {
+ xbt_os_sem_acquire(sem);
+ } else { /* timeout can be zero <-> try acquire ) */
+
+
+ seconds = (long) floor(end);
+ milliseconds = (long) ((end - seconds) * 1000);
+ milliseconds += (seconds * 1000);
+
+ switch (WaitForSingleObject(sem->h, milliseconds)) {
+ case WAIT_OBJECT_0:
+ EnterCriticalSection(&(sem->value_lock));
+ sem->value--;
+ LeaveCriticalSection(&(sem->value_lock));
+ return;
+
+ case WAIT_TIMEOUT:
+ THROW2(timeout_error, GetLastError(),
+ "semaphore %p wasn't signaled before timeout (%f)", sem,
+ timeout);
+ return;
+
+ default:
+ THROW3(system_error, GetLastError(),
+ "WaitForSingleObject(%p,%f) failed: %s", sem, timeout,
+ strerror(GetLastError()));
+ }
+ }
+}
+
+void xbt_os_sem_release(xbt_os_sem_t sem)
+{
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot release the NULL semaphore");
+
+ if (!ReleaseSemaphore(sem->h, 1, NULL))
+ THROW1(system_error, GetLastError(), "ReleaseSemaphore() failed: %s",
+ strerror(GetLastError()));
+ EnterCriticalSection(&(sem->value_lock));
+ sem->value++;
+ LeaveCriticalSection(&(sem->value_lock));
+}
+
+void xbt_os_sem_destroy(xbt_os_sem_t sem)
+{
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot destroy the NULL semaphore");
+
+ if (!CloseHandle(sem->h))
+ THROW1(system_error, GetLastError(), "CloseHandle() failed: %s",
+ strerror(GetLastError()));
+
+ DeleteCriticalSection(&(sem->value_lock));
+
+ xbt_free(sem);
+
+}
+
+void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
+{
+ if (!sem)
+ THROW0(arg_error, EINVAL, "Cannot get the value of the NULL semaphore");
+
+ EnterCriticalSection(&(sem->value_lock));
+ *svalue = sem->value;
+ LeaveCriticalSection(&(sem->value_lock));
}
#endif
