1 /* Copyright (c) 2007-2018. 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 #include "smx_private.hpp"
7 #include "src/kernel/activity/ConditionVariableImpl.hpp"
8 #include "src/kernel/activity/MutexImpl.hpp"
9 #include "src/kernel/activity/SynchroRaw.hpp"
10 #include "src/simix/smx_synchro_private.hpp"
11 #include "src/surf/cpu_interface.hpp"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_synchro, simix, "SIMIX Synchronization (mutex, semaphores and conditions)");
16 /***************************** Raw synchronization *********************************/
18 smx_activity_t SIMIX_synchro_wait(sg_host_t smx_host, double timeout)
20 XBT_IN("(%p, %f)",smx_host,timeout);
22 simgrid::kernel::activity::RawImplPtr sync =
23 simgrid::kernel::activity::RawImplPtr(new simgrid::kernel::activity::RawImpl());
24 sync->sleep = smx_host->pimpl_cpu->sleep(timeout);
25 sync->sleep->set_data(sync.get());
30 void SIMIX_synchro_stop_waiting(smx_actor_t process, smx_simcall_t simcall)
32 XBT_IN("(%p, %p)",process,simcall);
33 switch (simcall->call) {
35 case SIMCALL_MUTEX_LOCK:
36 simgrid::xbt::intrusive_erase(simcall_mutex_lock__get__mutex(simcall)->sleeping, *process);
39 case SIMCALL_COND_WAIT:
40 simgrid::xbt::intrusive_erase(simcall_cond_wait__get__cond(simcall)->sleeping, *process);
43 case SIMCALL_COND_WAIT_TIMEOUT:
44 simgrid::xbt::intrusive_erase(simcall_cond_wait_timeout__get__cond(simcall)->sleeping, *process);
45 simcall_cond_wait_timeout__set__result(simcall, 1); // signal a timeout
48 case SIMCALL_SEM_ACQUIRE:
49 simgrid::xbt::intrusive_erase(simcall_sem_acquire__get__sem(simcall)->sleeping, *process);
52 case SIMCALL_SEM_ACQUIRE_TIMEOUT:
53 simgrid::xbt::intrusive_erase(simcall_sem_acquire_timeout__get__sem(simcall)->sleeping, *process);
54 simcall_sem_acquire_timeout__set__result(simcall, 1); // signal a timeout
63 void SIMIX_synchro_finish(smx_activity_t synchro)
65 XBT_IN("(%p)", synchro.get());
66 smx_simcall_t simcall = synchro->simcalls.front();
67 synchro->simcalls.pop_front();
69 if (synchro->state != SIMIX_SRC_TIMEOUT) {
70 if (synchro->state == SIMIX_FAILED)
71 simcall->issuer->context->iwannadie = 1;
76 SIMIX_synchro_stop_waiting(simcall->issuer, simcall);
77 simcall->issuer->waiting_synchro = nullptr;
78 SIMIX_simcall_answer(simcall);
82 /******************************** Semaphores **********************************/
83 /** @brief Initialize a semaphore */
84 smx_sem_t SIMIX_sem_init(unsigned int value)
87 smx_sem_t sem = new s_smx_sem_t;
93 /** @brief Destroys a semaphore */
94 void SIMIX_sem_destroy(smx_sem_t sem)
97 XBT_DEBUG("Destroy semaphore %p", sem);
99 xbt_assert(sem->sleeping.empty(), "Cannot destroy semaphore since someone is still using it");
105 /** @brief release the semaphore
107 * Unlock a process waiting on the semaphore.
108 * If no one was blocked, the semaphore capacity is increased by 1.
110 void SIMIX_sem_release(smx_sem_t sem)
113 XBT_DEBUG("Sem release semaphore %p", sem);
114 if (not sem->sleeping.empty()) {
115 auto& proc = sem->sleeping.front();
116 sem->sleeping.pop_front();
117 proc.waiting_synchro = nullptr;
118 SIMIX_simcall_answer(&proc.simcall);
125 /** @brief Returns true if acquiring this semaphore would block */
126 int SIMIX_sem_would_block(smx_sem_t sem)
130 return (sem->value <= 0);
133 /** @brief Returns the current capacity of the semaphore */
134 int SIMIX_sem_get_capacity(smx_sem_t sem)
141 static void _SIMIX_sem_wait(smx_sem_t sem, double timeout, smx_actor_t issuer,
142 smx_simcall_t simcall)
144 XBT_IN("(%p, %f, %p, %p)",sem,timeout,issuer,simcall);
145 smx_activity_t synchro = nullptr;
147 XBT_DEBUG("Wait semaphore %p (timeout:%f)", sem, timeout);
148 if (sem->value <= 0) {
149 synchro = SIMIX_synchro_wait(issuer->host, timeout);
150 synchro->simcalls.push_front(simcall);
151 issuer->waiting_synchro = synchro;
152 sem->sleeping.push_back(*issuer);
155 SIMIX_simcall_answer(simcall);
161 * \brief Handles a sem acquire simcall without timeout.
163 void simcall_HANDLER_sem_acquire(smx_simcall_t simcall, smx_sem_t sem)
165 XBT_IN("(%p)",simcall);
166 _SIMIX_sem_wait(sem, -1, simcall->issuer, simcall);
171 * \brief Handles a sem acquire simcall with timeout.
173 void simcall_HANDLER_sem_acquire_timeout(smx_simcall_t simcall, smx_sem_t sem, double timeout)
175 XBT_IN("(%p)",simcall);
176 simcall_sem_acquire_timeout__set__result(simcall, 0); // default result, will be set to 1 on timeout
177 _SIMIX_sem_wait(sem, timeout, simcall->issuer, simcall);