/* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
/* in SG, when using HAVE_UCONTEXT_CONTEXTS, xbt_os_thread_stub is used instead */
-/* Copyright (c) 2007-2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2007-2019. 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. */
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt, "Synchronization mechanism (OS-level)");
-/* 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;
- 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;
-
-/* defaults attribute for pthreads */
-//FIXME: find where to put this
-static pthread_attr_t thread_attr;
-
-/* 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 = xbt_strdup("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
-}
-
-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_key_delete(xbt_self_thread_key)))
- // THROWF(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
- free(main_thread->name);
- free(main_thread);
- main_thread = NULL;
- thread_mod_inited = 0;
-#if !HAVE_SEM_INIT
- xbt_os_mutex_destroy(next_sem_ID_lock);
-#endif
-}
-
-/** 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_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
-}
-
-const char *xbt_os_thread_self_name(void)
-{
- xbt_os_thread_t me = xbt_os_thread_self();
- return me ? (const char *)me->name : "main";
-}
-
-void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
-{
- int errcode = pthread_join(thread->t, thread_return);
-
- xbt_assert(errcode==0, "pthread_join failed: %s", strerror(errcode));
- xbt_os_thread_free_thread_data(thread);
-}
-
-void xbt_os_thread_exit(int *retval)
-{
- pthread_exit(retval);
-}
-
-xbt_os_thread_t xbt_os_thread_self(void )
-{
- if (!thread_mod_inited)
- return NULL;
-
- return pthread_getspecific(xbt_self_thread_key);
-}
-
-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_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)
-{
- return pthread_getspecific(key);
-}
-
-void xbt_os_thread_detach(xbt_os_thread_t thread)
-{
- thread->detached = 1;
- pthread_detach(thread->t);
-}
-
-#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_ {
pthread_mutex_t m;
xbt_assert(errcode == 0, "pthread_mutex_destroy(%p) failed: %s", mutex, strerror(errcode));
free(mutex);
}
-
-/***** condition related functions *****/
-typedef struct xbt_os_cond_ {
- 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 = pthread_cond_init(&(res->c), NULL);
- xbt_assert(errcode==0, "pthread_cond_init() failed: %s", strerror(errcode));
- return res;
-}
-
-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));
-}
-
-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_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;
-
- int errcode = pthread_cond_destroy(&(cond->c));
- xbt_assert(errcode==0, "pthread_cond_destroy(%p) failed: %s", cond, strerror(errcode));
- free(cond);
-}
-
-typedef struct xbt_os_sem_ {
-#if !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
- */
-#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("/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)
- 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));
-
-#endif
-
- return res;
-}
-
-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_sem_release(xbt_os_sem_t sem)
-{
- if (sem_post(sem->ps) < 0)
- THROWF(system_error, errno, "sem_post() failed: %s", strerror(errno));
-}
-
-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
-}
-
-void xbt_os_thread_set_extra_data(void *data)
-{
- xbt_os_thread_self()->extra_data = data;
-}
-
-void *xbt_os_thread_get_extra_data(void)
-{
- xbt_os_thread_t thread = xbt_os_thread_self();
- return thread ? thread->extra_data : NULL;
-}
