-/* $Id$ */
-
/* xbt_os_thread -- portability layer over the pthread API */
/* 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 */
+/* in SG, when using HAVE_UCONTEXT_CONTEXTS, xbt_os_thread_stub is used instead */
-/* Copyright 2006,2007 Malek Cherier, Martin Quinson
- * All right reserved. */
+/* Copyright (c) 2007-2015. The SimGrid Team.
+ * All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
+#include "src/internal_config.h"
+#if HAVE_PTHREAD_SETAFFINITY
+#define _GNU_SOURCE
+#include <sched.h>
+#endif
+
+#include <pthread.h>
+
+#if defined(__FreeBSD__)
+#include "pthread_np.h"
+#define cpu_set_t cpuset_t
+#endif
+
+#include <limits.h>
+#include <semaphore.h>
+#include <errno.h>
+
+#if defined(_WIN32)
+#include <windows.h>
+#elif defined(__MACH__) && defined(__APPLE__)
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#else
+#include <unistd.h>
+#endif
+
#include "xbt/sysdep.h"
#include "xbt/ex.h"
-#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 "src/internal_config.h"
+#include "xbt/xbt_os_time.h" /* Portable time facilities */
+#include "xbt/xbt_os_thread.h" /* This module */
+#include "src/xbt_modinter.h" /* Initialization/finalization of this module */
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt, "Synchronization mechanism (OS-level)");
-
-/* ********************************* PTHREAD IMPLEMENTATION ************************************ */
-#ifdef HAVE_PTHREAD_H
-#include <pthread.h>
+/* use named semaphore when sem_init() does not work */
+#if !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;
- void *param;
- pvoid_f_pvoid_t *start_routine;
-} s_xbt_os_thread_t ;
+ pthread_t t;
+ int detached;
+ char *name;
+ void *param;
+ pvoid_f_pvoid_t start_routine;
+ void *extra_data;
+} s_xbt_os_thread_t;
+static xbt_os_thread_t main_thread = NULL;
/* thread-specific data containing the xbt_os_thread_t structure */
static pthread_key_t xbt_self_thread_key;
+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);
-}
+/* defaults attribute for pthreads */
+//FIXME: find where to put this
+static pthread_attr_t thread_attr;
-void xbt_os_thread_mod_init(void) {
- int errcode;
-
- 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_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");
+/* frees the xbt_os_thread_t corresponding to the current thread */
+static void xbt_os_thread_free_thread_data(xbt_os_thread_t thread)
+{
+ if (thread == main_thread) /* just killed main thread */
+ main_thread = NULL;
+ free(thread->name);
+ free(thread);
+}
+
+/* callback: termination */
+static void _os_thread_ex_terminate(xbt_ex_t * e)
+{
+ xbt_ex_display(e);
+ xbt_abort();
+ /* FIXME: there should be a configuration variable to choose to kill everyone or only this one */
+}
+
+void xbt_os_thread_mod_preinit(void)
+{
+ if (thread_mod_inited)
+ return;
+
+ int errcode = pthread_key_create(&xbt_self_thread_key, NULL);
+ xbt_assert(errcode == 0, "pthread_key_create failed for xbt_self_thread_key");
+
+ main_thread = xbt_new(s_xbt_os_thread_t, 1);
+ main_thread->name = NULL;
+ main_thread->detached = 0;
+ main_thread->name = (char *) "main";
+ main_thread->param = NULL;
+ main_thread->start_routine = NULL;
+ main_thread->extra_data = NULL;
+
+ if ((errcode = pthread_setspecific(xbt_self_thread_key, main_thread)))
+ THROWF(system_error, errcode,
+ "Impossible to set the SimGrid identity descriptor to the main thread (pthread_setspecific failed)");
+
+ pthread_attr_init(&thread_attr);
+
+ thread_mod_inited = 1;
+
+#if !HAVE_SEM_INIT
+ next_sem_ID_lock = xbt_os_mutex_init();
+#endif
}
-static void * wrapper_start_routine(void *s) {
- xbt_os_thread_t t = s;
- int errcode;
+void xbt_os_thread_mod_postexit(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_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_key_delete(xbt_self_thread_key)))
+ // THROWF(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
+ free(main_thread);
+ main_thread = NULL;
+ thread_mod_inited = 0;
+#if !HAVE_SEM_INIT
+ xbt_os_mutex_destroy(next_sem_ID_lock);
+#endif
}
-xbt_os_thread_t xbt_os_thread_create(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->start_routine = start_routine;
- res_thread->param = param;
-
-
- 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;
+/** Calls pthread_atfork() if present, and raise an exception otherwise.
+ *
+ * The only known user of this wrapper is mmalloc_preinit(), but it is absolutely mandatory there:
+ * when used with tesh, mmalloc *must* be mutex protected and resistant to forks.
+ * This functionality is the only way to get it working (by ensuring that the mutex is consistently released on forks)
+ */
+
+/* this function is critical to tesh+mmalloc, don't mess with it */
+int xbt_os_thread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
+{
+ return pthread_atfork(prepare, parent, child);
+}
+
+static void *wrapper_start_routine(void *s)
+{
+ xbt_os_thread_t t = s;
+
+ int errcode = pthread_setspecific(xbt_self_thread_key, t);
+ xbt_assert(errcode == 0, "pthread_setspecific failed for xbt_self_thread_key");
+
+ void *res = t->start_routine(t->param);
+ if (t->detached)
+ xbt_os_thread_free_thread_data(t);
+ return res;
+}
+
+xbt_os_thread_t xbt_os_thread_create(const char *name, pvoid_f_pvoid_t start_routine, void *param, void *extra_data)
+{
+ xbt_os_thread_t res_thread = xbt_new(s_xbt_os_thread_t, 1);
+ res_thread->detached = 0;
+ res_thread->name = xbt_strdup(name);
+ res_thread->start_routine = start_routine;
+ res_thread->param = param;
+ res_thread->extra_data = extra_data;
+
+ int errcode = pthread_create(&(res_thread->t), &thread_attr, wrapper_start_routine, res_thread);
+ xbt_assert(errcode == 0, "pthread_create failed: %s", strerror(errcode));
+
+ return res_thread;
+}
+
+/** Bind the thread to the given core, if possible.
+ *
+ * If pthread_setaffinity_np is not usable on that (non-gnu) platform, this function does nothing.
+ */
+int xbt_os_thread_bind(xbt_os_thread_t thread, int cpu){
+ int errcode = 0;
+#if HAVE_PTHREAD_SETAFFINITY
+ pthread_t pthread = thread->t;
+ cpu_set_t cpuset;
+ CPU_ZERO(&cpuset);
+ CPU_SET(cpu, &cpuset);
+ errcode = pthread_setaffinity_np(pthread, sizeof(cpu_set_t), &cpuset);
+#endif
+ return errcode;
}
-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));
- free(thread);
-}
-
-void xbt_os_thread_exit(int *retval) {
- pthread_exit(retval);
+void xbt_os_thread_setstacksize(int stack_size)
+{
+ size_t alignment[] = {
+ xbt_pagesize,
+#ifdef PTHREAD_STACK_MIN
+ PTHREAD_STACK_MIN,
+#endif
+ 0
+ };
+
+ xbt_assert(stack_size >= 0, "stack size %d is negative, maybe it exceeds MAX_INT?", stack_size);
+
+ size_t sz = stack_size;
+ int res = pthread_attr_setstacksize(&thread_attr, sz);
+
+ for (int i = 0; res == EINVAL && alignment[i] > 0; i++) {
+ /* Invalid size, try again with next multiple of alignment[i]. */
+ size_t rem = sz % alignment[i];
+ if (rem != 0 || sz == 0) {
+ size_t sz2 = sz - rem + alignment[i];
+ XBT_DEBUG("pthread_attr_setstacksize failed for %zd, try again with %zd", sz, sz2);
+ sz = sz2;
+ res = pthread_attr_setstacksize(&thread_attr, sz);
+ }
+ }
+
+ if (res == EINVAL)
+ XBT_WARN("invalid stack size (maybe too big): %zd", sz);
+ else if (res != 0)
+ XBT_WARN("unknown error %d in pthread stacksize setting: %zd", res, sz);
+}
+
+void xbt_os_thread_setguardsize(int guard_size)
+{
+#ifdef WIN32
+ THROW_UNIMPLEMENTED; //pthread_attr_setguardsize is not implemented in pthread.h on windows
+#else
+ size_t sz = guard_size;
+ int res = pthread_attr_setguardsize(&thread_attr, sz);
+ if (res)
+ XBT_WARN("pthread_attr_setguardsize failed (%d) for size: %zd", res, sz);
+#endif
}
-xbt_os_thread_t xbt_os_thread_self(void) {
- return pthread_getspecific(xbt_self_thread_key);
+const char *xbt_os_thread_self_name(void)
+{
+ xbt_os_thread_t me = xbt_os_thread_self();
+ return me ? me->name : "main";
}
-#include <sched.h>
-void xbt_os_thread_yield(void) {
- sched_yield();
-}
-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;
-} s_xbt_os_mutex_t;
+void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
+{
+ int errcode = pthread_join(thread->t, thread_return);
-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;
+ xbt_assert(errcode==0, "pthread_join failed: %s", strerror(errcode));
+ xbt_os_thread_free_thread_data(thread);
}
-void xbt_os_mutex_lock(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_thread_exit(int *retval)
+{
+ pthread_exit(retval);
}
-void xbt_os_mutex_unlock(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));
-}
+xbt_os_thread_t xbt_os_thread_self(void )
+{
+ if (!thread_mod_inited)
+ return NULL;
-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);
+ return pthread_getspecific(xbt_self_thread_key);
}
-/***** condition related functions *****/
-typedef struct xbt_os_cond_ {
- /* KEEP IT IN SYNC WITH xbt_thread.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));
-
- return res;
+void xbt_os_thread_key_create(xbt_os_thread_key_t* key)
+{
+ int errcode = pthread_key_create(key, NULL);
+ xbt_assert(errcode==0 , "pthread_key_create failed");
}
-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_thread_set_specific(xbt_os_thread_key_t key, void* value)
+{
+ int errcode = pthread_setspecific(key, value);
+ xbt_assert(errcode==0, "pthread_setspecific failed");
}
-#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();
- ts_end.tv_sec = (time_t) floor(end);
- ts_end.tv_nsec = (long) ( ( end - ts_end.tv_sec) * 1000000000);
- switch ( (errcode=pthread_cond_timedwait(&(cond->c),&(mutex->m), &ts_end)) ) {
- 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_thread_get_specific(xbt_os_thread_key_t key)
+{
+ return pthread_getspecific(key);
}
-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_thread_detach(xbt_os_thread_t thread)
+{
+ thread->detached = 1;
+ pthread_detach(thread->t);
}
-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);
+#include <sched.h>
+void xbt_os_thread_yield(void)
+{
+ sched_yield();
}
-void *xbt_os_thread_getparam(void) {
- xbt_os_thread_t t = xbt_os_thread_self();
- return t->param;
+void xbt_os_thread_cancel(xbt_os_thread_t t)
+{
+ pthread_cancel(t->t);
}
-/* ********************************* WINDOWS IMPLEMENTATION ************************************ */
+/****** mutex related functions ******/
+typedef struct xbt_os_mutex_ {
+ pthread_mutex_t m;
+} s_xbt_os_mutex_t;
-#elif defined(WIN32)
+#include <time.h>
+#include <math.h>
-typedef struct xbt_os_thread_ {
- 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 ;
+xbt_os_mutex_t xbt_os_mutex_init(void)
+{
+ pthread_mutexattr_t Attr;
+ pthread_mutexattr_init(&Attr);
+ pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
-/* key to the TLS containing the xbt_os_thread_t structure */
-static unsigned long xbt_self_thread_key;
+ xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
+ int errcode = pthread_mutex_init(&(res->m), &Attr);
+ xbt_assert(errcode==0, "pthread_mutex_init() failed: %s", strerror(errcode));
-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");
+ return res;
}
-static DWORD WINAPI wrapper_start_routine(void *s) {
- xbt_os_thread_t t = (xbt_os_thread_t)s;
-
- if(!TlsSetValue(xbt_self_thread_key,t))
- THROW0(system_error,(int)GetLastError(),"TlsSetValue of data describing the created thread failed");
-
- return (DWORD)t->start_routine(t->param);
+void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
+{
+ int errcode = pthread_mutex_lock(&(mutex->m));
+ xbt_assert(errcode==0, "pthread_mutex_lock(%p) failed: %s", mutex, strerror(errcode));
}
+void xbt_os_mutex_release(xbt_os_mutex_t mutex)
+{
+ int errcode = pthread_mutex_unlock(&(mutex->m));
+ xbt_assert(errcode==0, "pthread_mutex_unlock(%p) failed: %s", mutex, strerror(errcode));
+}
-xbt_os_thread_t xbt_os_thread_create(pvoid_f_pvoid_t start_routine,
- void* param) {
-
- xbt_os_thread_t t = xbt_new(s_xbt_os_thread_t,1);
+void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
+{
+ if (!mutex)
+ return;
- t->start_routine = start_routine ;
- t->param = param;
-
- t->handle = CreateThread(NULL,0,
- (LPTHREAD_START_ROUTINE)wrapper_start_routine,
- t,0,&(t->id));
-
- if(!t->handle) {
- xbt_free(t);
- THROW0(system_error,(int)GetLastError(),"CreateThread failed");
- }
-
- return t;
+ int errcode = pthread_mutex_destroy(&(mutex->m));
+ xbt_assert(errcode == 0, "pthread_mutex_destroy(%p) failed: %s", mutex, strerror(errcode));
+ free(mutex);
}
-void
-xbt_os_thread_join(xbt_os_thread_t thread,void ** thread_return) {
+/***** condition related functions *****/
+typedef struct xbt_os_cond_ {
+ pthread_cond_t c;
+} s_xbt_os_cond_t;
- 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);
+xbt_os_cond_t xbt_os_cond_init(void)
+{
+ xbt_os_cond_t res = xbt_new(s_xbt_os_cond_t, 1);
+ int errcode = pthread_cond_init(&(res->c), NULL);
+ xbt_assert(errcode==0, "pthread_cond_init() failed: %s", strerror(errcode));
+ return res;
}
-void xbt_os_thread_exit(int *retval) {
- if(retval)
- ExitThread(*retval);
- else
- ExitThread(0);
+void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex)
+{
+ int errcode = pthread_cond_wait(&(cond->c), &(mutex->m));
+ xbt_assert(errcode==0, "pthread_cond_wait(%p,%p) failed: %s", cond, mutex, strerror(errcode));
}
-xbt_os_thread_t xbt_os_thread_self(void) {
- return TlsGetValue(xbt_self_thread_key);
+void xbt_os_cond_signal(xbt_os_cond_t cond)
+{
+ int errcode = pthread_cond_signal(&(cond->c));
+ xbt_assert(errcode==0, "pthread_cond_signal(%p) failed: %s", cond, strerror(errcode));
}
-void *xbt_os_thread_getparam(void) {
- xbt_os_thread_t t = xbt_os_thread_self();
- return t->param;
+void xbt_os_cond_broadcast(xbt_os_cond_t cond)
+{
+ int errcode = pthread_cond_broadcast(&(cond->c));
+ xbt_assert(errcode==0, "pthread_cond_broadcast(%p) failed: %s", cond, strerror(errcode));
}
+void xbt_os_cond_destroy(xbt_os_cond_t cond)
+{
+ if (!cond)
+ return;
-void xbt_os_thread_yield(void) {
- Sleep(0);
-}
-void xbt_os_thread_cancel(xbt_os_thread_t t) {
- THROW_UNIMPLEMENTED;
+ int errcode = pthread_cond_destroy(&(cond->c));
+ xbt_assert(errcode==0, "pthread_cond_destroy(%p) failed: %s", cond, strerror(errcode));
+ free(cond);
}
-/****** mutex related functions ******/
-typedef struct xbt_os_mutex_ {
- /* KEEP IT IN SYNC WITH xbt_thread.c */
- CRITICAL_SECTION lock;
-} s_xbt_os_mutex_t;
+typedef struct xbt_os_sem_ {
+#if !HAVE_SEM_INIT
+ char *name;
+#endif
+ sem_t s;
+ sem_t *ps;
+} s_xbt_os_sem_t;
-xbt_os_mutex_t xbt_os_mutex_init(void) {
- xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t,1);
+#ifndef SEM_FAILED
+#define SEM_FAILED (-1)
+#endif
- /* initialize the critical section object */
- InitializeCriticalSection(&(res->lock));
-
- return res;
-}
+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
+ */
+#if HAVE_SEM_INIT
+ if (sem_init(&(res->s), 0, value) != 0)
+ THROWF(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", ++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, value);
+ }
+ if (res->ps == (sem_t *) SEM_FAILED)
+ THROWF(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)
+ THROWF(system_error, errno, "sem_unlink() failed: %s",
+ strerror(errno));
-void xbt_os_mutex_lock(xbt_os_mutex_t mutex) {
+#endif
- EnterCriticalSection(& mutex->lock);
+ return res;
}
-void xbt_os_mutex_unlock(xbt_os_mutex_t mutex) {
-
- LeaveCriticalSection (& mutex->lock);
-
+void xbt_os_sem_acquire(xbt_os_sem_t sem)
+{
+ if (sem_wait(sem->ps) < 0)
+ THROWF(system_error, errno, "sem_wait() failed: %s", strerror(errno));
}
-void xbt_os_mutex_destroy(xbt_os_mutex_t mutex) {
-
- if (!mutex) return;
-
- DeleteCriticalSection(& mutex->lock);
- free(mutex);
+void xbt_os_sem_release(xbt_os_sem_t sem)
+{
+ if (sem_post(sem->ps) < 0)
+ THROWF(system_error, errno, "sem_post() failed: %s", strerror(errno));
}
-/***** condition related functions *****/
- 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 */
-} s_xbt_os_cond_t;
+void xbt_os_sem_destroy(xbt_os_sem_t sem)
+{
+#if HAVE_SEM_INIT
+ if (sem_destroy(sem->ps) < 0)
+ THROWF(system_error, errno, "sem_destroy() failed: %s", strerror(errno));
+#else
+ if (sem_close(sem->ps) < 0)
+ THROWF(system_error, errno, "sem_close() failed: %s", strerror(errno));
+ xbt_free(sem->name);
+#endif
+ xbt_free(sem);
+}
+
+/** @brief Returns the amount of cores on the current host */
+int xbt_os_get_numcores(void) {
+#ifdef WIN32
+ SYSTEM_INFO sysinfo;
+ GetSystemInfo(&sysinfo);
+ return sysinfo.dwNumberOfProcessors;
+#elif defined(__APPLE__) && defined(__MACH__)
+ int nm[2];
+ size_t len = 4;
+ uint32_t count;
+
+ nm[0] = CTL_HW; nm[1] = HW_AVAILCPU;
+ sysctl(nm, 2, &count, &len, NULL, 0);
+
+ if(count < 1) {
+ nm[1] = HW_NCPU;
+ sysctl(nm, 2, &count, &len, NULL, 0);
+ if(count < 1) { count = 1; }
+ }
+ return count;
+#else
+ return sysconf(_SC_NPROCESSORS_ONLN);
+#endif
+}
-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) {
- 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");
+void xbt_os_thread_set_extra_data(void *data)
+{
+ xbt_os_thread_self()->extra_data = data;
}
-#endif
+void *xbt_os_thread_get_extra_data(void)
+{
+ xbt_os_thread_t thread = xbt_os_thread_self();
+ return thread ? thread->extra_data : NULL;
+}
