1 /* context_sysv - context switching with ucontexts from System V */
3 /* Copyright (c) 2009-2013. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #include "xbt/parmap.h"
12 #include "smx_private.h"
13 #include "internal_config.h"
14 #include "context_sysv_config.h" /* loads context system definitions */
18 # include <win32_ucontext.h> /* context relative declarations */
20 # include <ucontext.h> /* context relative declarations */
23 #ifdef HAVE_VALGRIND_VALGRIND_H
24 # include <valgrind/valgrind.h>
25 #endif /* HAVE_VALGRIND_VALGRIND_H */
27 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
29 typedef struct s_smx_ctx_sysv {
30 s_smx_ctx_base_t super; /* Fields of super implementation */
31 ucontext_t uc; /* the ucontext that executes the code */
32 unsigned int parmap_index;
33 #ifdef HAVE_VALGRIND_VALGRIND_H
34 unsigned int valgrind_stack_id; /* the valgrind stack id */
36 char stack[0]; /* the thread stack (must remain the last element of the structure) */
37 } s_smx_ctx_sysv_t, *smx_ctx_sysv_t;
39 #ifdef CONTEXT_THREADS
40 static xbt_parmap_t sysv_parmap;
41 static smx_ctx_sysv_t* sysv_workers_context; /* space to save the worker's context in each thread */
42 static unsigned long sysv_threads_working; /* number of threads that have started their work */
43 static xbt_os_thread_key_t sysv_worker_id_key; /* thread-specific storage for the thread id */
45 static unsigned long sysv_process_index = 0; /* index of the next process to run in the
46 * list of runnable processes */
47 static smx_ctx_sysv_t sysv_maestro_context;
49 static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory);
51 smx_ctx_sysv_create_context_sized(size_t structure_size,
52 xbt_main_func_t code, int argc,
54 void_pfn_smxprocess_t cleanup_func,
56 static void smx_ctx_sysv_free(smx_context_t context);
58 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
59 void_pfn_smxprocess_t cleanup_func, void* data);
61 static void smx_ctx_sysv_wrapper(int count, ...);
63 static void smx_ctx_sysv_stop_serial(smx_context_t context);
64 static void smx_ctx_sysv_suspend_serial(smx_context_t context);
65 static void smx_ctx_sysv_resume_serial(smx_process_t first_process);
66 static void smx_ctx_sysv_runall_serial(void);
68 static void smx_ctx_sysv_stop_parallel(smx_context_t context);
69 static void smx_ctx_sysv_suspend_parallel(smx_context_t context);
70 static void smx_ctx_sysv_resume_parallel(smx_process_t first_process);
71 static void smx_ctx_sysv_runall_parallel(void);
73 /* This is a bit paranoid about sizeof(smx_ctx_sysv_t) not being a multiple of
74 * sizeof(int), but it doesn't harm. */
75 #define CTX_ADDR_LEN \
76 (sizeof(smx_ctx_sysv_t) / sizeof(int) + \
77 !!(sizeof(smx_ctx_sysv_t) % sizeof(int)))
79 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
81 smx_ctx_base_factory_init(factory);
82 XBT_VERB("Activating SYSV context factory");
84 (*factory)->finalize = smx_ctx_sysv_factory_finalize;
85 (*factory)->create_context = smx_ctx_sysv_create_context;
86 /* Do not overload that method (*factory)->finalize */
87 (*factory)->free = smx_ctx_sysv_free;
88 (*factory)->name = "smx_sysv_context_factory";
90 if (SIMIX_context_is_parallel()) {
91 #ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
92 int nthreads = SIMIX_context_get_nthreads();
93 sysv_parmap = xbt_parmap_new(nthreads, SIMIX_context_get_parallel_mode());
94 sysv_workers_context = xbt_new(smx_ctx_sysv_t, nthreads);
95 sysv_maestro_context = NULL;
96 xbt_os_thread_key_create(&sysv_worker_id_key);
97 (*factory)->stop = smx_ctx_sysv_stop_parallel;
98 (*factory)->suspend = smx_ctx_sysv_suspend_parallel;
99 (*factory)->runall = smx_ctx_sysv_runall_parallel;
101 THROWF(arg_error, 0, "No thread support for parallel context execution");
104 (*factory)->stop = smx_ctx_sysv_stop_serial;
105 (*factory)->suspend = smx_ctx_sysv_suspend_serial;
106 (*factory)->runall = smx_ctx_sysv_runall_serial;
110 static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
112 #ifdef CONTEXT_THREADS
114 xbt_parmap_destroy(sysv_parmap);
115 xbt_free(sysv_workers_context);
117 return smx_ctx_base_factory_finalize(factory);
121 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
122 int argc, char **argv,
123 void_pfn_smxprocess_t cleanup_func,
126 int ctx_addr[CTX_ADDR_LEN];
127 smx_ctx_sysv_t context =
128 (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
135 /* if the user provided a function for the process then use it,
136 otherwise it is the context for maestro */
139 getcontext(&(context->uc));
141 context->uc.uc_link = NULL;
143 context->uc.uc_stack.ss_sp =
144 pth_skaddr_makecontext(context->stack, smx_context_stack_size);
146 context->uc.uc_stack.ss_size =
147 pth_sksize_makecontext(context->stack, smx_context_stack_size);
149 #ifdef HAVE_VALGRIND_VALGRIND_H
150 context->valgrind_stack_id =
151 VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
152 ((char *) context->uc.uc_stack.ss_sp) +
153 context->uc.uc_stack.ss_size);
154 #endif /* HAVE_VALGRIND_VALGRIND_H */
155 memcpy(ctx_addr, &context, sizeof(smx_ctx_sysv_t));
156 switch (CTX_ADDR_LEN) {
158 makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
162 makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
163 2, ctx_addr[0], ctx_addr[1]);
166 xbt_die("Ucontexts are not supported on this arch yet (addr len = %zu/%zu = %zu)",
167 sizeof(smx_ctx_sysv_t), sizeof(int), CTX_ADDR_LEN);
170 if(data != NULL && sysv_maestro_context == NULL)
171 sysv_maestro_context = context;
174 if(MC_is_active() && code)
175 MC_new_stack_area(context, ((smx_process_t)((smx_context_t)context)->data)->name, &(context->uc), size);
177 return (smx_context_t) context;
181 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
182 void_pfn_smxprocess_t cleanup_func,
186 return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size,
187 code, argc, argv, cleanup_func,
192 static void smx_ctx_sysv_free(smx_context_t context)
197 #ifdef HAVE_VALGRIND_VALGRIND_H
198 VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
199 context)->valgrind_stack_id);
200 #endif /* HAVE_VALGRIND_VALGRIND_H */
203 smx_ctx_base_free(context);
206 static void smx_ctx_sysv_wrapper(int first, ...)
208 int ctx_addr[CTX_ADDR_LEN];
209 smx_ctx_sysv_t context;
212 if (CTX_ADDR_LEN > 1) {
216 for (i = 1; i < CTX_ADDR_LEN; i++)
217 ctx_addr[i] = va_arg(ap, int);
220 memcpy(&context, ctx_addr, sizeof(smx_ctx_sysv_t));
221 (context->super.code) (context->super.argc, context->super.argv);
223 simix_global->context_factory->stop((smx_context_t) context);
226 static void smx_ctx_sysv_stop_serial(smx_context_t context)
228 smx_ctx_base_stop(context);
229 smx_ctx_sysv_suspend_serial(context);
232 static void smx_ctx_sysv_suspend_serial(smx_context_t context)
234 /* determine the next context */
235 smx_context_t next_context;
236 unsigned long int i = sysv_process_index++;
238 if (i < xbt_dynar_length(simix_global->process_to_run)) {
239 /* execute the next process */
240 XBT_DEBUG("Run next process");
241 next_context = xbt_dynar_get_as(
242 simix_global->process_to_run,i, smx_process_t)->context;
245 /* all processes were run, return to maestro */
246 XBT_DEBUG("No more process to run");
247 next_context = (smx_context_t) sysv_maestro_context;
249 SIMIX_context_set_current(next_context);
250 swapcontext(&((smx_ctx_sysv_t) context)->uc,
251 &((smx_ctx_sysv_t) next_context)->uc);
254 static void smx_ctx_sysv_resume_serial(smx_process_t first_process)
256 smx_context_t context = first_process->context;
257 SIMIX_context_set_current(context);
258 swapcontext(&sysv_maestro_context->uc,
259 &((smx_ctx_sysv_t) context)->uc);
262 static void smx_ctx_sysv_runall_serial(void)
264 smx_process_t first_process =
265 xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
266 sysv_process_index = 1;
268 /* execute the first process */
269 smx_ctx_sysv_resume_serial(first_process);
272 static void smx_ctx_sysv_stop_parallel(smx_context_t context)
274 smx_ctx_base_stop(context);
275 smx_ctx_sysv_suspend_parallel(context);
278 static void smx_ctx_sysv_suspend_parallel(smx_context_t context)
280 #ifdef CONTEXT_THREADS
281 /* determine the next context */
282 smx_process_t next_work;
283 smx_context_t next_context;
284 ucontext_t* next_stack;
286 next_work = xbt_parmap_next(sysv_parmap,
287 &((smx_ctx_sysv_t) context)->parmap_index);
288 if (next_work != NULL) {
289 /* there is a next process to resume */
290 XBT_DEBUG("Run next process");
291 next_context = next_work->context;
292 next_stack = &((smx_ctx_sysv_t) next_context)->uc;
293 ((smx_ctx_sysv_t) next_context)->parmap_index =
294 ((smx_ctx_sysv_t) context)->parmap_index;
297 /* all processes were run, go to the barrier */
298 XBT_DEBUG("No more processes to run");
299 unsigned long worker_id =
300 (unsigned long) xbt_os_thread_get_specific(sysv_worker_id_key);
301 next_context = (smx_context_t)sysv_workers_context[worker_id];
302 next_stack = &((smx_ctx_sysv_t)next_context)->uc;
305 SIMIX_context_set_current(next_context);
306 swapcontext(&((smx_ctx_sysv_t) context)->uc, next_stack);
310 static void smx_ctx_sysv_resume_parallel(smx_process_t first_process)
312 #ifdef CONTEXT_THREADS
313 unsigned long worker_id = __sync_fetch_and_add(&sysv_threads_working, 1);
314 xbt_os_thread_set_specific(sysv_worker_id_key, (void*) worker_id);
315 smx_ctx_sysv_t worker_context = (smx_ctx_sysv_t)SIMIX_context_self();
316 sysv_workers_context[worker_id] = worker_context;
317 ucontext_t* worker_stack = &worker_context->uc;
318 unsigned int index = 0;
320 first_process = xbt_parmap_next(sysv_parmap, &index);
321 if (first_process != NULL) {
322 smx_context_t context = first_process->context;
323 ((smx_ctx_sysv_t) context)->parmap_index = index;
324 SIMIX_context_set_current(context);
325 swapcontext(worker_stack, &((smx_ctx_sysv_t) context)->uc);
330 static void smx_ctx_sysv_runall_parallel(void)
332 #ifdef CONTEXT_THREADS
333 sysv_threads_working = 0;
334 xbt_parmap_apply(sysv_parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel,
335 simix_global->process_to_run,
336 1 + SIMIX_context_get_parallel_threshold() / SIMIX_context_get_nthreads(), 1);