1 /* context_sysv - context switching with ucontextes from System V */
3 /* Copyright (c) 2009, 2010. 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 "smx_context_sysv_private.h"
13 #ifdef HAVE_VALGRIND_VALGRIND_H
14 # include <valgrind/valgrind.h>
15 #endif /* HAVE_VALGRIND_VALGRIND_H */
22 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
25 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char** argv,
26 void_f_pvoid_t cleanup_func, void* cleanup_arg);
29 static void smx_ctx_sysv_wrapper(void);
31 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory) {
33 smx_ctx_base_factory_init(factory);
35 (*factory)->create_context = smx_ctx_sysv_create_context;
36 /* Do not overload that method (*factory)->finalize */
37 (*factory)->free = smx_ctx_sysv_free;
38 (*factory)->stop = smx_ctx_sysv_stop;
39 (*factory)->suspend = smx_ctx_sysv_suspend;
40 (*factory)->resume = smx_ctx_sysv_resume;
41 (*factory)->name = "smx_sysv_context_factory";
45 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code, int argc, char** argv,
46 void_f_pvoid_t cleanup_func, void* cleanup_arg) {
48 smx_ctx_sysv_t context = (smx_ctx_sysv_t)smx_ctx_base_factory_create_context_sized
49 (size, code,argc,argv,cleanup_func,cleanup_arg);
51 /* If the user provided a function for the process then use it
52 otherwise is the context for maestro */
55 xbt_assert2(getcontext(&(context->uc)) == 0,
56 "Error in context saving: %d (%s)", errno, strerror(errno));
58 context->uc.uc_link = NULL;
60 context->uc.uc_stack.ss_sp =
61 pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
63 context->uc.uc_stack.ss_size =
64 pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
66 #ifdef HAVE_VALGRIND_VALGRIND_H
67 context->valgrind_stack_id =
68 VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
69 ((char *) context->uc.uc_stack.ss_sp) +
70 context->uc.uc_stack.ss_size);
71 #endif /* HAVE_VALGRIND_VALGRIND_H */
73 makecontext(&((smx_ctx_sysv_t)context)->uc, smx_ctx_sysv_wrapper, 0);
76 return (smx_context_t)context;
81 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char** argv,
82 void_f_pvoid_t cleanup_func, void* cleanup_arg) {
84 return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
85 code,argc,argv,cleanup_func,cleanup_arg);
89 void smx_ctx_sysv_free(smx_context_t context) {
93 #ifdef HAVE_VALGRIND_VALGRIND_H
94 VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) context)->valgrind_stack_id);
95 #endif /* HAVE_VALGRIND_VALGRIND_H */
98 smx_ctx_base_free(context);
101 void smx_ctx_sysv_stop(smx_context_t context) {
102 smx_ctx_base_stop(context);
104 smx_ctx_sysv_suspend(context);
107 void smx_ctx_sysv_wrapper() {
108 /*FIXME: I would like to avoid accessing simix_global to get the current
109 context by passing it as an argument of the wrapper function. The problem
110 is that this function is called from smx_ctx_sysv_start, and uses
111 makecontext for calling it, and the stupid posix specification states that
112 all the arguments of the function should be int(32 bits), making it useless
113 in 64-bit architectures where pointers are 64 bit long.
115 smx_ctx_sysv_t context =
116 (smx_ctx_sysv_t)simix_global->current_process->context;
118 (context->super.code) (context->super.argc, context->super.argv);
120 smx_ctx_sysv_stop((smx_context_t)context);
123 void smx_ctx_sysv_suspend(smx_context_t context) {
124 ucontext_t maestro_ctx = ((smx_ctx_sysv_t)simix_global->maestro_process->context)->uc;
126 int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx);
128 xbt_assert0((rv == 0), "Context swapping failure");
131 void smx_ctx_sysv_resume(smx_context_t new_context) {
132 smx_ctx_sysv_t maestro = (smx_ctx_sysv_t)simix_global->maestro_process->context;
134 int rv = swapcontext(&(maestro->uc), &((smx_ctx_sysv_t)new_context)->uc);
136 xbt_assert0((rv == 0), "Context swapping failure");