/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
+#include <stdarg.h>
-
-#include "smx_context_sysv_private.h"
-
-#ifdef HAVE_VALGRIND_VALGRIND_H
-# include <valgrind/valgrind.h>
-#endif /* HAVE_VALGRIND_VALGRIND_H */
+#include "xbt/parmap.h"
+#include "simix/private.h"
+#include "gras_config.h"
+#include "context_sysv_config.h" /* loads context system definitions */
#ifdef _XBT_WIN32
- #include "win32_ucontext.h"
- #include "win32_ucontext.c"
+# include <win32_ucontext.h> /* context relative declarations */
#else
- #include "ucontext.h"
+# include <ucontext.h> /* context relative declarations */
#endif
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-
-static smx_context_t
-smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char** argv,
- void_f_pvoid_t cleanup_func, void* cleanup_arg);
+#ifdef HAVE_VALGRIND_VALGRIND_H
+# include <valgrind/valgrind.h>
+#endif /* HAVE_VALGRIND_VALGRIND_H */
+XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-static void smx_ctx_sysv_wrapper(void);
+typedef struct s_smx_ctx_sysv {
+ s_smx_ctx_base_t super; /* Fields of super implementation */
+ ucontext_t uc; /* the ucontext that executes the code */
+#ifdef HAVE_VALGRIND_VALGRIND_H
+ unsigned int valgrind_stack_id; /* the valgrind stack id */
+#endif
+ char stack[0]; /* the thread stack (must remain the last element of the structure) */
+} s_smx_ctx_sysv_t, *smx_ctx_sysv_t;
+
+#ifdef CONTEXT_THREADS
+static xbt_parmap_t sysv_parmap;
+static ucontext_t* sysv_workers_stacks; /* space to save the worker's stack in each thread */
+static unsigned long sysv_threads_working; /* number of threads that have started their work */
+static xbt_os_thread_key_t sysv_worker_id_key; /* thread-specific storage for the thread id */
+#endif
+static unsigned long sysv_process_index = 0; /* index of the next process to run in the
+ * list of runnable processes */
+static smx_ctx_sysv_t sysv_maestro_context;
-void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory) {
+static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory);
+static smx_context_t
+smx_ctx_sysv_create_context_sized(size_t structure_size,
+ xbt_main_func_t code, int argc,
+ char **argv,
+ void_pfn_smxprocess_t cleanup_func,
+ void *data);
+static void smx_ctx_sysv_free(smx_context_t context);
+static smx_context_t
+smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
+ void_pfn_smxprocess_t cleanup_func, void* data);
+
+static void smx_ctx_sysv_wrapper(int count, ...);
+
+static void smx_ctx_sysv_stop_serial(smx_context_t context);
+static void smx_ctx_sysv_suspend_serial(smx_context_t context);
+static void smx_ctx_sysv_resume_serial(smx_process_t first_process);
+static void smx_ctx_sysv_runall_serial(void);
+
+static void smx_ctx_sysv_stop_parallel(smx_context_t context);
+static void smx_ctx_sysv_suspend_parallel(smx_context_t context);
+static void smx_ctx_sysv_resume_parallel(smx_process_t first_process);
+static void smx_ctx_sysv_runall_parallel(void);
+
+/* This is a bit paranoid about SIZEOF_VOIDP not being a multiple of SIZEOF_INT,
+ * but it doesn't harm. */
+#define CTX_ADDR_LEN (SIZEOF_VOIDP / SIZEOF_INT + !!(SIZEOF_VOIDP % SIZEOF_INT))
+union u_ctx_addr {
+ void *addr;
+ int intv[CTX_ADDR_LEN];
+};
+#if (CTX_ADDR_LEN == 1)
+# define CTX_ADDR_SPLIT(u) (u).intv[0]
+#elif (CTX_ADDR_LEN == 2)
+# define CTX_ADDR_SPLIT(u) (u).intv[0], (u).intv[1]
+#else
+# error Your architecture is not supported yet
+#endif
+void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
+{
smx_ctx_base_factory_init(factory);
+ XBT_VERB("Activating SYSV context factory");
+ (*factory)->finalize = smx_ctx_sysv_factory_finalize;
(*factory)->create_context = smx_ctx_sysv_create_context;
/* Do not overload that method (*factory)->finalize */
(*factory)->free = smx_ctx_sysv_free;
- (*factory)->stop = smx_ctx_sysv_stop;
- (*factory)->suspend = smx_ctx_sysv_suspend;
- (*factory)->resume = smx_ctx_sysv_resume;
(*factory)->name = "smx_sysv_context_factory";
-}
-
-smx_context_t
-smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code, int argc, char** argv,
- void_f_pvoid_t cleanup_func, void* cleanup_arg) {
- smx_ctx_sysv_t context = (smx_ctx_sysv_t)smx_ctx_base_factory_create_context_sized
- (size, code,argc,argv,cleanup_func,cleanup_arg);
+ if (SIMIX_context_is_parallel()) {
+#ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
+ int nthreads = SIMIX_context_get_nthreads();
+ sysv_parmap = xbt_parmap_new(nthreads, SIMIX_context_get_parallel_mode());
+ sysv_workers_stacks = xbt_new(ucontext_t, nthreads);
+ xbt_os_thread_key_create(&sysv_worker_id_key);
+ (*factory)->stop = smx_ctx_sysv_stop_parallel;
+ (*factory)->suspend = smx_ctx_sysv_suspend_parallel;
+ (*factory)->runall = smx_ctx_sysv_runall_parallel;
+#else
+ THROWF(arg_error, 0, "No thread support for parallel context execution");
+#endif
+ } else {
+ (*factory)->stop = smx_ctx_sysv_stop_serial;
+ (*factory)->suspend = smx_ctx_sysv_suspend_serial;
+ (*factory)->runall = smx_ctx_sysv_runall_serial;
+ }
+}
- /* If the user provided a function for the process then use it
- otherwise is the context for maestro */
- if(code){
+static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
+{
+#ifdef CONTEXT_THREADS
+ if (sysv_parmap)
+ xbt_parmap_destroy(sysv_parmap);
+ xbt_free(sysv_workers_stacks);
+#endif
+ return smx_ctx_base_factory_finalize(factory);
+}
- xbt_assert2(getcontext(&(context->uc)) == 0,
- "Error in context saving: %d (%s)", errno, strerror(errno));
+static smx_context_t
+smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
+ int argc, char **argv,
+ void_pfn_smxprocess_t cleanup_func,
+ void *data)
+{
+ union u_ctx_addr ctx_addr;
+ smx_ctx_sysv_t context =
+ (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
+ code,
+ argc,
+ argv,
+ cleanup_func,
+ data);
+
+ /* if the user provided a function for the process then use it,
+ otherwise it is the context for maestro */
+ if (code) {
+
+ getcontext(&(context->uc));
context->uc.uc_link = NULL;
context->uc.uc_stack.ss_sp =
- pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE);
+ pth_skaddr_makecontext(context->stack, smx_context_stack_size);
context->uc.uc_stack.ss_size =
- pth_sksize_makecontext(context->stack, CONTEXT_STACK_SIZE);
+ pth_sksize_makecontext(context->stack, smx_context_stack_size);
#ifdef HAVE_VALGRIND_VALGRIND_H
context->valgrind_stack_id =
VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
- ((char *) context->uc.uc_stack.ss_sp) +
- context->uc.uc_stack.ss_size);
-#endif /* HAVE_VALGRIND_VALGRIND_H */
-
- makecontext(&((smx_ctx_sysv_t)context)->uc, smx_ctx_sysv_wrapper, 0);
+ ((char *) context->uc.uc_stack.ss_sp) +
+ context->uc.uc_stack.ss_size);
+#endif /* HAVE_VALGRIND_VALGRIND_H */
+ ctx_addr.addr = context;
+ makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
+ CTX_ADDR_LEN, CTX_ADDR_SPLIT(ctx_addr));
+ } else {
+ sysv_maestro_context = context;
}
- return (smx_context_t)context;
-
+ return (smx_context_t) context;
}
static smx_context_t
-smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char** argv,
- void_f_pvoid_t cleanup_func, void* cleanup_arg) {
+smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
+ void_pfn_smxprocess_t cleanup_func,
+ void *data)
+{
- return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
- code,argc,argv,cleanup_func,cleanup_arg);
+ return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size,
+ code, argc, argv, cleanup_func,
+ data);
}
-void smx_ctx_sysv_free(smx_context_t context) {
+static void smx_ctx_sysv_free(smx_context_t context)
+{
- if (context){
+ if (context) {
#ifdef HAVE_VALGRIND_VALGRIND_H
- VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) context)->valgrind_stack_id);
-#endif /* HAVE_VALGRIND_VALGRIND_H */
+ VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
+ context)->valgrind_stack_id);
+#endif /* HAVE_VALGRIND_VALGRIND_H */
}
smx_ctx_base_free(context);
}
-void smx_ctx_sysv_stop(smx_context_t context) {
+static void smx_ctx_sysv_wrapper(int first, ...)
+{
+ union u_ctx_addr ctx_addr;
+ smx_ctx_sysv_t context;
+
+ ctx_addr.intv[0] = first;
+ if (CTX_ADDR_LEN > 1) {
+ va_list ap;
+ int i;
+ va_start(ap, first);
+ for (i = 1; i < CTX_ADDR_LEN; i++)
+ ctx_addr.intv[i] = va_arg(ap, int);
+ va_end(ap);
+ }
+ context = ctx_addr.addr;
+ (context->super.code) (context->super.argc, context->super.argv);
+
+ simix_global->context_factory->stop((smx_context_t) context);
+}
+
+static void smx_ctx_sysv_stop_serial(smx_context_t context)
+{
smx_ctx_base_stop(context);
+ smx_ctx_sysv_suspend_serial(context);
+}
- smx_ctx_sysv_suspend(context);
+static void smx_ctx_sysv_suspend_serial(smx_context_t context)
+{
+ /* determine the next context */
+ smx_context_t next_context;
+ unsigned long int i = sysv_process_index++;
+
+ if (i < xbt_dynar_length(simix_global->process_to_run)) {
+ /* execute the next process */
+ XBT_DEBUG("Run next process");
+ next_context = xbt_dynar_get_as(
+ simix_global->process_to_run,i, smx_process_t)->context;
+ }
+ else {
+ /* all processes were run, return to maestro */
+ XBT_DEBUG("No more process to run");
+ next_context = (smx_context_t) sysv_maestro_context;
+ }
+ SIMIX_context_set_current(next_context);
+ swapcontext(&((smx_ctx_sysv_t) context)->uc,
+ &((smx_ctx_sysv_t) next_context)->uc);
}
-void smx_ctx_sysv_wrapper() {
- /*FIXME: I would like to avoid accessing simix_global to get the current
- context by passing it as an argument of the wrapper function. The problem
- is that this function is called from smx_ctx_sysv_start, and uses
- makecontext for calling it, and the stupid posix specification states that
- all the arguments of the function should be int(32 bits), making it useless
- in 64-bit architectures where pointers are 64 bit long.
- */
- smx_ctx_sysv_t context =
- (smx_ctx_sysv_t)simix_global->current_process->context;
+static void smx_ctx_sysv_resume_serial(smx_process_t first_process)
+{
+ smx_context_t context = first_process->context;
+ SIMIX_context_set_current(context);
+ swapcontext(&sysv_maestro_context->uc,
+ &((smx_ctx_sysv_t) context)->uc);
+}
- (context->super.code) (context->super.argc, context->super.argv);
+static void smx_ctx_sysv_runall_serial(void)
+{
+ if (!xbt_dynar_is_empty(simix_global->process_to_run)) {
+ smx_process_t first_process =
+ xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
+ sysv_process_index = 1;
- smx_ctx_sysv_stop((smx_context_t)context);
+ /* execute the first process */
+ smx_ctx_sysv_resume_serial(first_process);
+ }
}
-void smx_ctx_sysv_suspend(smx_context_t context) {
- ucontext_t maestro_ctx = ((smx_ctx_sysv_t)simix_global->maestro_process->context)->uc;
+static void smx_ctx_sysv_stop_parallel(smx_context_t context)
+{
+ smx_ctx_base_stop(context);
+ smx_ctx_sysv_suspend_parallel(context);
+}
- int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx);
+static void smx_ctx_sysv_suspend_parallel(smx_context_t context)
+{
+#ifdef CONTEXT_THREADS
+ /* determine the next context */
+ smx_process_t next_work = xbt_parmap_next(sysv_parmap);
+ smx_context_t next_context;
+ ucontext_t* next_stack;
+
+ if (next_work != NULL) {
+ /* there is a next process to resume */
+ XBT_DEBUG("Run next process");
+ next_context = next_work->context;
+ next_stack = &((smx_ctx_sysv_t) next_context)->uc;
+ }
+ else {
+ /* all processes were run, go to the barrier */
+ XBT_DEBUG("No more processes to run");
+ next_context = (smx_context_t) sysv_maestro_context;
+ unsigned long worker_id =
+ (unsigned long) xbt_os_thread_get_specific(sysv_worker_id_key);
+ next_stack = &sysv_workers_stacks[worker_id];
+ }
- xbt_assert0((rv == 0), "Context swapping failure");
+ SIMIX_context_set_current(next_context);
+ swapcontext(&((smx_ctx_sysv_t) context)->uc, next_stack);
+#endif
}
-void smx_ctx_sysv_resume(smx_context_t new_context) {
- smx_ctx_sysv_t maestro = (smx_ctx_sysv_t)simix_global->maestro_process->context;
+static void smx_ctx_sysv_resume_parallel(smx_process_t first_process)
+{
+#ifdef CONTEXT_THREADS
+ unsigned long worker_id = __sync_fetch_and_add(&sysv_threads_working, 1);
+ xbt_os_thread_set_specific(sysv_worker_id_key, (void*) worker_id);
+ ucontext_t* worker_stack = &sysv_workers_stacks[worker_id];
- int rv = swapcontext(&(maestro->uc), &((smx_ctx_sysv_t)new_context)->uc);
+ smx_context_t context = first_process->context;
+ SIMIX_context_set_current(context);
+ swapcontext(worker_stack, &((smx_ctx_sysv_t) context)->uc);
+#endif
+}
- xbt_assert0((rv == 0), "Context swapping failure");
+static void smx_ctx_sysv_runall_parallel(void)
+{
+#ifdef CONTEXT_THREADS
+ sysv_threads_working = 0;
+ xbt_parmap_apply(sysv_parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel,
+ simix_global->process_to_run);
+#endif
}
