1 /* Copyright (c) 2009-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include "xbt/function_types.h"
11 #include "smx_private.h"
12 #include "src/portable.h" /* loads context system definitions */
14 #include "xbt/xbt_os_thread.h"
15 #include "src/xbt_modinter.h" /* prototype of os thread module's init/exit in XBT */
17 #include "src/simix/ThreadContext.hpp"
19 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
21 static xbt_os_sem_t smx_ctx_thread_sem = nullptr;
26 XBT_PRIVATE ContextFactory* thread_factory()
28 XBT_VERB("Activating thread context factory");
29 return new ThreadContextFactory();
32 ThreadContextFactory::ThreadContextFactory()
33 : ContextFactory("ThreadContextFactory")
35 if (SIMIX_context_is_parallel()) {
36 smx_ctx_thread_sem = xbt_os_sem_init(SIMIX_context_get_nthreads());
38 smx_ctx_thread_sem = nullptr;
42 ThreadContextFactory::~ThreadContextFactory()
44 if (smx_ctx_thread_sem) {
45 xbt_os_sem_destroy(smx_ctx_thread_sem);
46 smx_ctx_thread_sem = nullptr;
50 ThreadContext* ThreadContextFactory::create_context(
51 std::function<void()> code,
52 void_pfn_smxprocess_t cleanup, smx_process_t process)
54 return this->new_context<ThreadContext>(std::move(code), cleanup, process);
57 ThreadContext::ThreadContext(std::function<void()> code,
58 void_pfn_smxprocess_t cleanup, smx_process_t process)
59 : Context(std::move(code), cleanup, process)
61 /* If the user provided a function for the process then use it
62 otherwise is the context for maestro */
64 this->begin_ = xbt_os_sem_init(0);
65 this->end_ = xbt_os_sem_init(0);
66 if (smx_context_stack_size_was_set)
67 xbt_os_thread_setstacksize(smx_context_stack_size);
68 if (smx_context_guard_size_was_set)
69 xbt_os_thread_setguardsize(smx_context_guard_size);
71 /* create and start the process */
72 /* NOTE: The first argument to xbt_os_thread_create used to be the process *
73 * name, but now the name is stored at SIMIX level, so we pass a null */
75 xbt_os_thread_create(NULL, ThreadContext::wrapper, this, this);
77 /* wait the starting of the newly created process */
78 xbt_os_sem_acquire(this->end_);
81 xbt_os_thread_set_extra_data(this);
85 void ThreadContextFactory::run_all()
87 if (smx_ctx_thread_sem == nullptr) {
89 smx_process_t process;
91 xbt_dynar_foreach(simix_global->process_to_run, cursor, process) {
92 XBT_DEBUG("Handling %p",process);
93 ThreadContext* context = static_cast<ThreadContext*>(process->context);
94 xbt_os_sem_release(context->begin_);
95 xbt_os_sem_acquire(context->end_);
100 smx_process_t process;
101 xbt_dynar_foreach(simix_global->process_to_run, index, process)
102 xbt_os_sem_release(static_cast<ThreadContext*>(process->context)->begin_);
103 xbt_dynar_foreach(simix_global->process_to_run, index, process)
104 xbt_os_sem_acquire(static_cast<ThreadContext*>(process->context)->end_);
108 ThreadContext* ThreadContextFactory::self()
110 return static_cast<ThreadContext*>(xbt_os_thread_get_extra_data());
113 ThreadContext::~ThreadContext()
115 /* check if this is the context of maestro (it doesn't have a real thread) */
117 /* wait about the thread terminason */
118 xbt_os_thread_join(this->thread_, nullptr);
120 /* destroy the synchronisation objects */
121 xbt_os_sem_destroy(this->begin_);
122 xbt_os_sem_destroy(this->end_);
126 void *ThreadContext::wrapper(void *param)
128 ThreadContext* context = static_cast<ThreadContext*>(param);
131 /* Install alternate signal stack, for SIGSEGV handler. */
133 stack.ss_sp = sigsegv_stack;
134 stack.ss_size = sizeof sigsegv_stack;
136 sigaltstack(&stack, nullptr);
138 /* Tell the maestro we are starting, and wait for its green light */
139 xbt_os_sem_release(context->end_);
140 xbt_os_sem_acquire(context->begin_);
141 if (smx_ctx_thread_sem) /* parallel run */
142 xbt_os_sem_acquire(smx_ctx_thread_sem);
149 void ThreadContext::stop()
152 if (smx_ctx_thread_sem)
153 xbt_os_sem_release(smx_ctx_thread_sem);
155 // Signal to the maestro that it has finished:
156 xbt_os_sem_release(this->end_);
158 xbt_os_thread_exit(NULL);
161 void ThreadContext::suspend()
163 if (smx_ctx_thread_sem)
164 xbt_os_sem_release(smx_ctx_thread_sem);
165 xbt_os_sem_release(this->end_);
166 xbt_os_sem_acquire(this->begin_);
167 if (smx_ctx_thread_sem)
168 xbt_os_sem_acquire(smx_ctx_thread_sem);