1 /* Copyright (c) 2002-2023. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 /* SimGrid's pthread interposer. Actual implementation of the symbols (see the comment in sthread.h) */
9 #include "xbt/string.hpp"
10 #include <simgrid/actor.h>
11 #include <simgrid/s4u/Actor.hpp>
12 #include <simgrid/s4u/Engine.hpp>
13 #include <simgrid/s4u/Mutex.hpp>
14 #include <simgrid/s4u/NetZone.hpp>
15 #include <simgrid/s4u/Semaphore.hpp>
17 #include <xbt/sysdep.h>
19 #include "src/internal_config.h"
20 #include "src/sthread/sthread.h"
25 #include <semaphore.h>
29 #include <string_view>
32 XBT_LOG_NEW_DEFAULT_CATEGORY(sthread, "pthread intercepter");
33 namespace sg4 = simgrid::s4u;
35 static sg4::Host* lilibeth = nullptr;
37 int sthread_main(int argc, char** argv, char** envp, int (*raw_main)(int, char**, char**))
39 /* Do not intercept the main when run from SMPI: it will initialize the simulation properly */
40 for (int i = 0; envp[i] != nullptr; i++)
41 if (std::string_view(envp[i]).rfind("SMPI_GLOBAL_SIZE", 0) == 0) {
42 printf("sthread refuses to intercept the SMPI application %s directly, as its interception is done otherwise.\n",
44 return raw_main(argc, argv, envp);
47 /* Do not intercept valgrind step 1 */
48 if (not strcmp(argv[0], "/usr/bin/valgrind.bin") || not strcmp(argv[0], "/bin/sh")) {
49 printf("sthread refuses to intercept the execution of %s. Running the application unmodified.\n", argv[0]);
51 return raw_main(argc, argv, envp);
54 /* If not in SMPI, the old main becomes an actor in a newly created simulation */
55 printf("sthread is intercepting the execution of %s\n", argv[0]);
58 sg4::Engine e(&argc, argv);
59 auto* zone = sg4::create_full_zone("world");
60 lilibeth = zone->create_host("Lilibeth", 1e15);
63 /* Launch the user's main() on an actor */
65 sg4::ActorPtr main_actor = sg4::Actor::create("main thread", lilibeth, raw_main, argc, argv, envp);
67 sg4::Engine::get_instance()->run();
69 XBT_INFO("All threads exited. Terminating the simulation.");
74 struct sthread_mutex {
78 int sthread_create(unsigned long int* thread, const void* /*pthread_attr_t* attr*/, void* (*start_routine)(void*),
83 XBT_VERB("Create thread %d", TID);
84 std::string name = std::string("thread ") + std::to_string(TID);
86 if (SMPI_is_inited()) {
88 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
89 name = simgrid::xbt::string_printf("%d:%d", rank, TID);
92 sg4::ActorPtr actor = sg4::Actor::create(
94 [](auto* user_function, auto* param) {
100 user_function(param);
105 intrusive_ptr_add_ref(actor.get());
106 *thread = reinterpret_cast<unsigned long>(actor.get());
109 int sthread_join(sthread_t thread, void** /*retval*/)
111 sg4::ActorPtr actor(reinterpret_cast<sg4::Actor*>(thread));
113 intrusive_ptr_release(actor.get());
118 int sthread_mutex_init(sthread_mutex_t* mutex, const void* /*pthread_mutexattr_t* attr*/)
120 auto m = sg4::Mutex::create();
121 intrusive_ptr_add_ref(m.get());
123 mutex->mutex = m.get();
127 int sthread_mutex_lock(sthread_mutex_t* mutex)
129 /* At least in glibc, PTHREAD_STATIC_INITIALIZER sets every fields to 0 */
130 if (mutex->mutex == nullptr)
131 sthread_mutex_init(mutex, nullptr);
133 static_cast<sg4::Mutex*>(mutex->mutex)->lock();
137 int sthread_mutex_trylock(sthread_mutex_t* mutex)
139 /* At least in glibc, PTHREAD_STATIC_INITIALIZER sets every fields to 0 */
140 if (mutex->mutex == nullptr)
141 sthread_mutex_init(mutex, nullptr);
143 XBT_DEBUG("%s(%p)", __FUNCTION__, mutex);
144 if (static_cast<sg4::Mutex*>(mutex->mutex)->try_lock())
149 int sthread_mutex_unlock(sthread_mutex_t* mutex)
151 /* At least in glibc, PTHREAD_STATIC_INITIALIZER sets every fields to 0 */
152 if (mutex->mutex == nullptr)
153 sthread_mutex_init(mutex, nullptr);
155 static_cast<sg4::Mutex*>(mutex->mutex)->unlock();
158 int sthread_mutex_destroy(sthread_mutex_t* mutex)
160 /* At least in glibc, PTHREAD_STATIC_INITIALIZER sets every fields to 0 */
161 if (mutex->mutex == nullptr)
162 sthread_mutex_init(mutex, nullptr);
164 intrusive_ptr_release(static_cast<sg4::Mutex*>(mutex->mutex));
167 int sthread_sem_init(sthread_sem_t* sem, int /*pshared*/, unsigned int value)
169 auto s = sg4::Semaphore::create(value);
170 intrusive_ptr_add_ref(s.get());
175 int sthread_sem_destroy(sthread_sem_t* sem)
177 intrusive_ptr_release(static_cast<sg4::Semaphore*>(sem->sem));
180 int sthread_sem_post(sthread_sem_t* sem)
182 static_cast<sg4::Semaphore*>(sem->sem)->release();
185 int sthread_sem_wait(sthread_sem_t* sem)
187 static_cast<sg4::Semaphore*>(sem->sem)->acquire();
190 int sthread_sem_trywait(sthread_sem_t* sem)
192 auto* s = static_cast<sg4::Semaphore*>(sem->sem);
193 if (s->would_block()) {
200 int sthread_sem_timedwait(sthread_sem_t* sem, const struct timespec* abs_timeout)
202 if (static_cast<sg4::Semaphore*>(sem->sem)->acquire_timeout(static_cast<double>(abs_timeout->tv_sec) +
203 static_cast<double>(abs_timeout->tv_nsec) / 1E9)) {
210 int sthread_gettimeofday(struct timeval* tv)
213 double now = simgrid::s4u::Engine::get_clock();
214 double secs = trunc(now);
215 double usecs = (now - secs) * 1e6;
216 tv->tv_sec = static_cast<time_t>(secs);
217 tv->tv_usec = static_cast<decltype(tv->tv_usec)>(usecs); // suseconds_t
222 void sthread_sleep(double seconds)
224 simgrid::s4u::this_actor::sleep_for(seconds);
228 int pthread_cond_init(pthread_cond_t *cond, pthread_condattr_t *cond_attr) {
229 *cond = sg_cond_init();
233 int pthread_cond_signal(pthread_cond_t *cond) {
234 sg_cond_notify_one(*cond);
238 int pthread_cond_broadcast(pthread_cond_t *cond) {
239 sg_cond_notify_all(*cond);
243 int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) {
244 sg_cond_wait(*cond, *mutex);
248 int pthread_cond_destroy(pthread_cond_t *cond) {
249 sg_cond_destroy(*cond);