3 /* context_sysv - implementation of context switching with ucontextes from Sys V */
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 "smx_context_private.h"
12 #ifdef HAVE_VALGRIND_VALGRIND_H
13 # include <valgrind/valgrind.h>
14 #endif /* HAVE_VALGRIND_VALGRIND_H */
16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
19 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char** argv,
20 void_f_pvoid_t cleanup_func, void* cleanup_arg);
23 static void smx_ctx_sysv_wrapper(void);
25 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory) {
27 smx_ctx_base_factory_init(factory);
29 (*factory)->create_context = smx_ctx_sysv_create_context;
30 /* Do not overload that method (*factory)->finalize */
31 (*factory)->free = smx_ctx_sysv_free;
32 (*factory)->stop = smx_ctx_sysv_stop;
33 (*factory)->suspend = smx_ctx_sysv_suspend;
34 (*factory)->resume = smx_ctx_sysv_resume;
35 (*factory)->name = "smx_sysv_context_factory";
39 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code, int argc, char** argv,
40 void_f_pvoid_t cleanup_func, void* cleanup_arg) {
42 smx_ctx_sysv_t context = (smx_ctx_sysv_t)smx_ctx_base_factory_create_context_sized
43 (size, code,argc,argv,cleanup_func,cleanup_arg);
45 /* If the user provided a function for the process then use it
46 otherwise is the context for maestro */
49 xbt_assert2(getcontext(&(context->uc)) == 0,
50 "Error in context saving: %d (%s)", errno, strerror(errno));
52 context->uc.uc_link = NULL;
54 context->uc.uc_stack.ss_sp =
55 pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
57 context->uc.uc_stack.ss_size =
58 pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
60 #ifdef HAVE_VALGRIND_VALGRIND_H
61 context->valgrind_stack_id =
62 VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
63 ((char *) context->uc.uc_stack.ss_sp) +
64 context->uc.uc_stack.ss_size);
65 #endif /* HAVE_VALGRIND_VALGRIND_H */
67 makecontext(&((smx_ctx_sysv_t)context)->uc, smx_ctx_sysv_wrapper, 0);
70 return (smx_context_t)context;
75 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char** argv,
76 void_f_pvoid_t cleanup_func, void* cleanup_arg) {
78 return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
79 code,argc,argv,cleanup_func,cleanup_arg);
83 void smx_ctx_sysv_free(smx_context_t context) {
87 #ifdef HAVE_VALGRIND_VALGRIND_H
88 VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) context)->valgrind_stack_id);
89 #endif /* HAVE_VALGRIND_VALGRIND_H */
92 smx_ctx_base_free(context);
95 void smx_ctx_sysv_stop(smx_context_t context) {
96 smx_ctx_base_stop(context);
98 smx_ctx_sysv_suspend(context);
101 void smx_ctx_sysv_wrapper() {
102 /*FIXME: I would like to avoid accessing simix_global to get the current
103 context by passing it as an argument of the wrapper function. The problem
104 is that this function is called from smx_ctx_sysv_start, and uses
105 makecontext for calling it, and the stupid posix specification states that
106 all the arguments of the function should be int(32 bits), making it useless
107 in 64-bit architectures where pointers are 64 bit long.
109 smx_ctx_sysv_t context =
110 (smx_ctx_sysv_t)simix_global->current_process->context;
112 (context->super.code) (context->super.argc, context->super.argv);
114 smx_ctx_sysv_stop((smx_context_t)context);
117 void smx_ctx_sysv_suspend(smx_context_t context) {
118 ucontext_t maestro_ctx = ((smx_ctx_sysv_t)simix_global->maestro_process->context)->uc;
120 int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx);
122 xbt_assert0((rv == 0), "Context swapping failure");
125 void smx_ctx_sysv_resume(smx_context_t new_context) {
126 smx_ctx_sysv_t maestro = (smx_ctx_sysv_t)simix_global->maestro_process->context;
128 int rv = swapcontext(&(maestro->uc), &((smx_ctx_sysv_t)new_context)->uc);
130 xbt_assert0((rv == 0), "Context swapping failure");