1 /* xbt_os_thread -- portability layer over the pthread API */
2 /* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
3 /* in SG, when using HAVE_UCONTEXT_CONTEXTS, xbt_os_thread_stub is used instead */
5 /* Copyright (c) 2007-2018. The SimGrid Team. All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include "src/internal_config.h"
11 #if HAVE_PTHREAD_SETAFFINITY
18 #if defined(__FreeBSD__)
19 #include "pthread_np.h"
20 #define cpu_set_t cpuset_t
24 #include <semaphore.h>
29 #elif defined(__MACH__) && defined(__APPLE__)
31 #include <sys/types.h>
32 #include <sys/sysctl.h>
37 #include "xbt/sysdep.h"
39 #include "src/internal_config.h"
40 #include "xbt/xbt_os_time.h" /* Portable time facilities */
41 #include "xbt/xbt_os_thread.h" /* This module */
42 #include "src/xbt_modinter.h" /* Initialization/finalization of this module */
44 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt, "Synchronization mechanism (OS-level)");
46 typedef struct xbt_os_thread_ {
50 pvoid_f_pvoid_t start_routine;
53 static xbt_os_thread_t main_thread = NULL;
55 /* thread-specific data containing the xbt_os_thread_t structure */
56 static pthread_key_t xbt_self_thread_key;
57 static int thread_mod_inited = 0;
59 /* defaults attribute for pthreads */
60 //FIXME: find where to put this
61 static pthread_attr_t thread_attr;
63 /* frees the xbt_os_thread_t corresponding to the current thread */
64 static void xbt_os_thread_free_thread_data(xbt_os_thread_t thread)
66 if (thread == main_thread) /* just killed main thread */
72 void xbt_os_thread_mod_preinit(void)
74 if (thread_mod_inited)
77 int errcode = pthread_key_create(&xbt_self_thread_key, NULL);
78 xbt_assert(errcode == 0, "pthread_key_create failed for xbt_self_thread_key");
80 main_thread = xbt_new(s_xbt_os_thread_t, 1);
81 main_thread->name = NULL;
82 main_thread->name = xbt_strdup("main");
83 main_thread->param = NULL;
84 main_thread->start_routine = NULL;
85 main_thread->extra_data = NULL;
87 if ((errcode = pthread_setspecific(xbt_self_thread_key, main_thread)))
88 THROWF(system_error, errcode,
89 "Impossible to set the SimGrid identity descriptor to the main thread (pthread_setspecific failed)");
91 pthread_attr_init(&thread_attr);
93 thread_mod_inited = 1;
96 void xbt_os_thread_mod_postexit(void)
98 /* FIXME: don't try to free our key on shutdown.
99 Valgrind detects no leak if we don't, and whine if we try to */
102 // if ((errcode=pthread_key_delete(xbt_self_thread_key)))
103 // THROWF(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
104 free(main_thread->name);
107 thread_mod_inited = 0;
110 /** Calls pthread_atfork() if present, and raise an exception otherwise.
112 * The only known user of this wrapper is mmalloc_preinit(), but it is absolutely mandatory there:
113 * when used with tesh, mmalloc *must* be mutex protected and resistant to forks.
114 * This functionality is the only way to get it working (by ensuring that the mutex is consistently released on forks)
117 /* this function is critical to tesh+mmalloc, don't mess with it */
118 int xbt_os_thread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
120 return pthread_atfork(prepare, parent, child);
123 static void *wrapper_start_routine(void *s)
125 xbt_os_thread_t t = s;
127 int errcode = pthread_setspecific(xbt_self_thread_key, t);
128 xbt_assert(errcode == 0, "pthread_setspecific failed for xbt_self_thread_key");
130 return t->start_routine(t->param);
133 xbt_os_thread_t xbt_os_thread_create(const char *name, pvoid_f_pvoid_t start_routine, void *param, void *extra_data)
135 xbt_os_thread_t res_thread = xbt_new(s_xbt_os_thread_t, 1);
136 res_thread->name = xbt_strdup(name);
137 res_thread->start_routine = start_routine;
138 res_thread->param = param;
139 res_thread->extra_data = extra_data;
141 int errcode = pthread_create(&(res_thread->t), &thread_attr, wrapper_start_routine, res_thread);
142 xbt_assert(errcode == 0, "pthread_create failed: %s", strerror(errcode));
147 /** Bind the thread to the given core, if possible.
149 * If pthread_setaffinity_np is not usable on that (non-gnu) platform, this function does nothing.
151 int xbt_os_thread_bind(XBT_ATTRIB_UNUSED xbt_os_thread_t thread, XBT_ATTRIB_UNUSED int cpu)
154 #if HAVE_PTHREAD_SETAFFINITY
155 pthread_t pthread = thread->t;
158 CPU_SET(cpu, &cpuset);
159 errcode = pthread_setaffinity_np(pthread, sizeof(cpu_set_t), &cpuset);
164 void xbt_os_thread_setstacksize(int stack_size)
166 size_t alignment[] = {
168 #ifdef PTHREAD_STACK_MIN
174 xbt_assert(stack_size >= 0, "stack size %d is negative, maybe it exceeds MAX_INT?", stack_size);
176 size_t sz = stack_size;
177 int res = pthread_attr_setstacksize(&thread_attr, sz);
179 for (int i = 0; res == EINVAL && alignment[i] > 0; i++) {
180 /* Invalid size, try again with next multiple of alignment[i]. */
181 size_t rem = sz % alignment[i];
182 if (rem != 0 || sz == 0) {
183 size_t sz2 = sz - rem + alignment[i];
184 XBT_DEBUG("pthread_attr_setstacksize failed for %zu, try again with %zu", sz, sz2);
186 res = pthread_attr_setstacksize(&thread_attr, sz);
191 XBT_WARN("invalid stack size (maybe too big): %zu", sz);
193 XBT_WARN("unknown error %d in pthread stacksize setting: %zu", res, sz);
196 void xbt_os_thread_setguardsize(int guard_size)
199 THROW_UNIMPLEMENTED; //pthread_attr_setguardsize is not implemented in pthread.h on windows
201 size_t sz = guard_size;
202 int res = pthread_attr_setguardsize(&thread_attr, sz);
204 XBT_WARN("pthread_attr_setguardsize failed (%d) for size: %zu", res, sz);
208 const char *xbt_os_thread_self_name(void)
210 xbt_os_thread_t me = xbt_os_thread_self();
211 return me ? (const char *)me->name : "main";
214 void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
216 int errcode = pthread_join(thread->t, thread_return);
218 xbt_assert(errcode==0, "pthread_join failed: %s", strerror(errcode));
219 xbt_os_thread_free_thread_data(thread);
222 void xbt_os_thread_exit(int *retval)
224 pthread_exit(retval);
227 xbt_os_thread_t xbt_os_thread_self(void )
229 if (!thread_mod_inited)
232 return pthread_getspecific(xbt_self_thread_key);
235 /****** mutex related functions ******/
236 typedef struct xbt_os_mutex_ {
243 xbt_os_mutex_t xbt_os_mutex_init(void)
245 pthread_mutexattr_t Attr;
246 pthread_mutexattr_init(&Attr);
247 pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
249 xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
250 int errcode = pthread_mutex_init(&(res->m), &Attr);
251 xbt_assert(errcode==0, "pthread_mutex_init() failed: %s", strerror(errcode));
256 void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
258 int errcode = pthread_mutex_lock(&(mutex->m));
259 xbt_assert(errcode==0, "pthread_mutex_lock(%p) failed: %s", mutex, strerror(errcode));
262 void xbt_os_mutex_release(xbt_os_mutex_t mutex)
264 int errcode = pthread_mutex_unlock(&(mutex->m));
265 xbt_assert(errcode==0, "pthread_mutex_unlock(%p) failed: %s", mutex, strerror(errcode));
268 void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
273 int errcode = pthread_mutex_destroy(&(mutex->m));
274 xbt_assert(errcode == 0, "pthread_mutex_destroy(%p) failed: %s", mutex, strerror(errcode));
278 void xbt_os_thread_set_extra_data(void *data)
280 xbt_os_thread_self()->extra_data = data;
283 void *xbt_os_thread_get_extra_data(void)
285 xbt_os_thread_t thread = xbt_os_thread_self();
286 return thread ? thread->extra_data : NULL;