3 /* context_thread - implementation of context switching with native threads */
5 /* Copyright (c) 2004-2008 the SimGrid team. All right 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 "xbt/function_types.h"
13 #include "portable.h" /* loads context system definitions */
15 #include "xbt/xbt_os_thread.h"
17 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
19 typedef struct s_smx_ctx_thread {
21 xbt_os_thread_t thread; /* a plain dumb thread (portable to posix or windows) */
22 xbt_os_sem_t begin; /* this semaphore is used to schedule/yield the process */
23 xbt_os_sem_t end; /* this semaphore is used to schedule/unschedule the process */
24 } s_smx_ctx_thread_t, *smx_ctx_thread_t;
27 smx_ctx_thread_factory_create_context(xbt_main_func_t code, int argc, char** argv,
28 void_f_pvoid_t cleanup_func, void* cleanup_arg);
30 static smx_context_t smx_ctx_thread_factory_create_master_context(void);
32 static int smx_ctx_thread_factory_finalize(smx_context_factory_t * factory);
34 static void smx_ctx_thread_free(smx_context_t context);
36 static void smx_ctx_thread_start(smx_context_t context);
38 static void smx_ctx_thread_stop(smx_context_t context);
40 static void smx_ctx_thread_suspend(smx_context_t context);
43 smx_ctx_thread_resume(smx_context_t old_context, smx_context_t new_context);
45 static void *smx_ctx_thread_wrapper(void *param);
47 void SIMIX_ctx_thread_factory_init(smx_context_factory_t * factory)
49 *factory = xbt_new0(s_smx_context_factory_t, 1);
51 (*factory)->create_context = smx_ctx_thread_factory_create_context;
52 (*factory)->finalize = smx_ctx_thread_factory_finalize;
53 (*factory)->create_maestro_context = smx_ctx_thread_factory_create_master_context;
54 (*factory)->free = smx_ctx_thread_free;
55 (*factory)->start = smx_ctx_thread_start;
56 (*factory)->stop = smx_ctx_thread_stop;
57 (*factory)->suspend = smx_ctx_thread_suspend;
58 (*factory)->resume = smx_ctx_thread_resume;
59 (*factory)->name = "ctx_thread_factory";
62 static smx_context_t smx_ctx_thread_factory_create_master_context(void)
64 return (smx_context_t) xbt_new0(s_smx_ctx_thread_t, 1);
67 static int smx_ctx_thread_factory_finalize(smx_context_factory_t * factory)
75 smx_ctx_thread_factory_create_context(xbt_main_func_t code, int argc, char** argv,
76 void_f_pvoid_t cleanup_func, void* cleanup_arg)
78 smx_ctx_thread_t context = xbt_new0(s_smx_ctx_thread_t, 1);
83 context->cleanup_func = cleanup_func;
84 context->cleanup_arg = cleanup_arg;
85 context->begin = xbt_os_sem_init(0);
86 context->end = xbt_os_sem_init(0);
88 return (smx_context_t)context;
91 static void smx_ctx_thread_free(smx_context_t pcontext)
94 smx_ctx_thread_t context = (smx_ctx_thread_t)pcontext;
96 /* check if this is the context of maestro (it doesn't has a real thread) */
97 if (context->thread) {
98 /* wait about the thread terminason */
99 xbt_os_thread_join(context->thread, NULL);
101 /* destroy the synchronisation objects */
102 xbt_os_sem_destroy(context->begin);
103 xbt_os_sem_destroy(context->end);
108 for (i = 0; i < context->argc; i++)
109 if (context->argv[i])
110 free(context->argv[i]);
115 /* finally destroy the context */
119 static void smx_ctx_thread_start(smx_context_t context)
121 smx_ctx_thread_t ctx_thread = (smx_ctx_thread_t)context;
123 /* create and start the process */
124 /* NOTE: The first argument to xbt_os_thread_create used to be the process *
125 * name, but now the name is stored at SIMIX level, so we pass a null */
127 xbt_os_thread_create(NULL, smx_ctx_thread_wrapper, ctx_thread);
129 /* wait the starting of the newly created process */
130 xbt_os_sem_acquire(ctx_thread->end);
133 static void smx_ctx_thread_stop(smx_context_t pcontext)
136 smx_ctx_thread_t context = (smx_ctx_thread_t)pcontext;
138 /* please no debug here: our procdata was already free'd */
139 if (context->cleanup_func)
140 (*context->cleanup_func) (context->cleanup_arg);
142 /* signal to the maestro that it has finished */
143 xbt_os_sem_release(((smx_ctx_thread_t) context)->end);
146 /* We should provide return value in case other wants it */
147 xbt_os_thread_exit(NULL);
150 static void *smx_ctx_thread_wrapper(void *param)
152 smx_ctx_thread_t context = (smx_ctx_thread_t) param;
154 /* Tell the maestro we are starting, and wait for its green light */
155 xbt_os_sem_release(context->end);
156 xbt_os_sem_acquire(context->begin);
158 (context->code) (context->argc, context->argv);
160 smx_ctx_thread_stop((smx_context_t)context);
164 static void smx_ctx_thread_suspend(smx_context_t context)
166 xbt_os_sem_release(((smx_ctx_thread_t) context)->end);
167 xbt_os_sem_acquire(((smx_ctx_thread_t) context)->begin);
170 static void smx_ctx_thread_resume(smx_context_t not_used,
171 smx_context_t new_context)
173 xbt_os_sem_release(((smx_ctx_thread_t) new_context)->begin);
174 xbt_os_sem_acquire(((smx_ctx_thread_t) new_context)->end);