* under the terms of the license (GNU LGPL) which comes with this package. */
#include "src/internal_config.h"
-#ifdef HAVE_PTHREAD_SETAFFINITY
+#if HAVE_PTHREAD_SETAFFINITY
#define _GNU_SOURCE
#include <sched.h>
#endif
#include <semaphore.h>
#include <errno.h>
-#if defined(WIN32)
+#if defined(_WIN32)
+#include <windows.h>
#elif defined(__MACH__) && defined(__APPLE__)
#include <stdint.h>
#include <sys/types.h>
#include "xbt/sysdep.h"
#include "xbt/ex.h"
-#include "src/xbt/ex_interface.h" /* We play crude games with exceptions */
-#include "src/portable.h"
+#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)");
-
-/* use named sempahore when sem_init() does not work */
-#ifndef HAVE_SEM_INIT
+/* 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
char *name;
void *param;
pvoid_f_pvoid_t start_routine;
- xbt_running_ctx_t *running_ctx;
void *extra_data;
} s_xbt_os_thread_t;
static xbt_os_thread_t main_thread = NULL;
{
if (thread == main_thread) /* just killed main thread */
main_thread = NULL;
-
- free(thread->running_ctx);
free(thread->name);
free(thread);
}
-/* callback: context fetching */
-static xbt_running_ctx_t *_os_thread_get_running_ctx(void)
-{
- return xbt_os_thread_self()->running_ctx;
-}
-
/* callback: termination */
static void _os_thread_ex_terminate(xbt_ex_t * e)
{
main_thread->name = (char *) "main";
main_thread->param = NULL;
main_thread->start_routine = NULL;
- main_thread->running_ctx = xbt_new(xbt_running_ctx_t, 1);
main_thread->extra_data = NULL;
- XBT_RUNNING_CTX_INITIALIZE(main_thread->running_ctx);
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)");
-
- __xbt_running_ctx_fetch = _os_thread_get_running_ctx;
- __xbt_ex_terminate = _os_thread_ex_terminate;
pthread_attr_init(&thread_attr);
thread_mod_inited = 1;
-#ifndef HAVE_SEM_INIT
+#if !HAVE_SEM_INIT
next_sem_ID_lock = xbt_os_mutex_init();
#endif
}
// 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->running_ctx);
free(main_thread);
main_thread = NULL;
thread_mod_inited = 0;
-#ifndef HAVE_SEM_INIT
+#if !HAVE_SEM_INIT
xbt_os_mutex_destroy(next_sem_ID_lock);
#endif
-
- /* Restore the default exception setup */
- __xbt_running_ctx_fetch = &__xbt_ex_ctx_default;
- __xbt_ex_terminate = &__xbt_ex_terminate_default;
}
+/** 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 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->name = xbt_strdup(name);
res_thread->start_routine = start_routine;
res_thread->param = param;
- res_thread->running_ctx = xbt_new(xbt_running_ctx_t, 1);
- XBT_RUNNING_CTX_INITIALIZE(res_thread->running_ctx);
res_thread->extra_data = extra_data;
int errcode = pthread_create(&(res_thread->t), &thread_attr, wrapper_start_routine, res_thread);
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;
-#ifdef HAVE_PTHREAD_SETAFFINITY
+#if HAVE_PTHREAD_SETAFFINITY
pthread_t pthread = thread->t;
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
#endif
}
-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 me = xbt_os_thread_self();
pthread_exit(retval);
}
-xbt_os_thread_t xbt_os_thread_self(void)
+xbt_os_thread_t xbt_os_thread_self(void )
{
if (!thread_mod_inited)
return NULL;
xbt_assert(errcode==0 , "pthread_key_create failed");
}
-void xbt_os_thread_set_specific(xbt_os_thread_key_t key, void* value) {
-
+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");
}
-void* xbt_os_thread_get_specific(xbt_os_thread_key_t key) {
+void* xbt_os_thread_get_specific(xbt_os_thread_key_t key)
+{
return pthread_getspecific(key);
}
xbt_assert(errcode==0, "pthread_cond_wait(%p,%p) failed: %s", cond, mutex, strerror(errcode));
}
-
-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);
- XBT_DEBUG("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:
- THROWF(timeout_error, errcode,
- "condition %p (mutex %p) wasn't signaled before timeout (%f)",
- cond, mutex, delay);
- default:
- THROWF(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 = pthread_cond_signal(&(cond->c));
}
typedef struct xbt_os_sem_ {
-#ifndef HAVE_SEM_INIT
+#if !HAVE_SEM_INIT
char *name;
#endif
sem_t s;
* 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 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);
+ res->name = bprintf("/sg-%d", ++next_sem_ID);
xbt_os_mutex_release(next_sem_ID_lock);
+ sem_unlink(res->name);
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';
+ sem_unlink(res->name);
res->ps = sem_open(res->name, O_CREAT, 0644, value);
}
if (res->ps == (sem_t *) SEM_FAILED)
void xbt_os_sem_destroy(xbt_os_sem_t sem)
{
-#ifdef HAVE_SEM_INIT
+#if HAVE_SEM_INIT
if (sem_destroy(sem->ps) < 0)
- THROWF(system_error, errno, "sem_destroy() failed: %s",
- strerror(errno));
+ 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);
}
-void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
-{
- if (sem_getvalue(&(sem->s), svalue) < 0)
- THROWF(system_error, errno, "sem_getvalue() failed: %s",
- strerror(errno));
-}
-
-
/** @brief Returns the amount of cores on the current host */
int xbt_os_get_numcores(void) {
#ifdef WIN32
