* under the terms of the license (GNU LGPL) which comes with this package. */
#include <stdarg.h>
+
#include "smx_context_sysv_private.h"
#include "xbt/parmap.h"
#include "simix/private.h"
+#include "gras_config.h"
#ifdef HAVE_VALGRIND_VALGRIND_H
# include <valgrind/valgrind.h>
#ifdef _XBT_WIN32
#include "win32_ucontext.h"
-#include "win32_ucontext.c"
#else
#include "ucontext.h"
#endif
XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-static xbt_parmap_t parmap;
+#ifdef CONTEXT_THREADS
+static xbt_parmap_t smx_ctx_sysv_parmap;
+static ucontext_t* smx_ctx_sysv_local_maestro_uc; /* space to save maestro's stack in each thread */
+#endif
+static unsigned long smx_ctx_sysv_process_index = 0; /* index of the next process to run in the
+ * list of runnable processes */
+static smx_ctx_sysv_t smx_ctx_sysv_maestro_context;
+
static smx_context_t
smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
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);
- VERB0("Activating SYSV context 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)->name = "smx_sysv_context_factory";
- if (smx_parallel_contexts) {
+ if (SIMIX_context_is_parallel()) {
#ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
- parmap = xbt_parmap_new(2);
+ int nthreads = SIMIX_context_get_nthreads();
+ smx_ctx_sysv_parmap = xbt_parmap_new(nthreads);
+ smx_ctx_sysv_local_maestro_uc = xbt_new(ucontext_t, nthreads);
+ (*factory)->stop = smx_ctx_sysv_stop_parallel;
+ (*factory)->suspend = smx_ctx_sysv_suspend_parallel;
(*factory)->runall = smx_ctx_sysv_runall_parallel;
(*factory)->self = smx_ctx_sysv_self_parallel;
#else
- THROW0(arg_error, 0, "No thread support for parallel context execution");
+ THROWF(arg_error, 0, "No thread support for parallel context execution");
#endif
- }else{
- (*factory)->runall = smx_ctx_sysv_runall;
+ } else {
+ (*factory)->stop = smx_ctx_sysv_stop_serial;
+ (*factory)->suspend = smx_ctx_sysv_suspend_serial;
+ (*factory)->runall = smx_ctx_sysv_runall_serial;
}
}
int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
{
- if(parmap)
- xbt_parmap_destroy(parmap);
+#ifdef CONTEXT_THREADS
+ if (smx_ctx_sysv_parmap)
+ xbt_parmap_destroy(smx_ctx_sysv_parmap);
+ xbt_free(smx_ctx_sysv_local_maestro_uc);
+#endif
return smx_ctx_base_factory_finalize(factory);
}
void_pfn_smxprocess_t cleanup_func,
void *data)
{
- uintptr_t ctx_addr;
+ union u_ctx_addr ctx_addr;
smx_ctx_sysv_t context =
(smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
code,
cleanup_func,
data);
- /* If the user provided a function for the process then use it
- otherwise is the context for maestro */
+ /* if the user provided a function for the process then use it,
+ otherwise it is the context for maestro */
if (code) {
- xbt_assert2(getcontext(&(context->uc)) == 0,
- "Error in context saving: %d (%s)", errno,
- strerror(errno));
+ int res = getcontext(&(context->uc));
+ xbt_assert(res == 0,
+ "Error in context saving: %d (%s)", errno,
+ strerror(errno));
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 =
((char *) context->uc.uc_stack.ss_sp) +
context->uc.uc_stack.ss_size);
#endif /* HAVE_VALGRIND_VALGRIND_H */
- ctx_addr = (uintptr_t)context;
- /* This switch select a case base on a static value: the compiler optimizes it out */
- /* It could be replaced by a set of #ifdef/#else/#endif blocks */
- switch(sizeof(uintptr_t) / sizeof(int)) {
- case 1:
- makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper,
- 2, 1, (int)ctx_addr);
- break;
- case 2:
- makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper,
- 3, 2, (int)(ctx_addr >> (8 * sizeof(int))), (int)(ctx_addr));
- break;
- default:
- THROW_IMPOSSIBLE;
- }
- }else{
- maestro_context = context;
+ ctx_addr.addr = context;
+ makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
+ CTX_ADDR_LEN, CTX_ADDR_SPLIT(ctx_addr));
+ } else {
+ smx_ctx_sysv_maestro_context = context;
}
return (smx_context_t) context;
-
}
static smx_context_t
void *data)
{
- return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t),
+ return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size,
code, argc, argv, cleanup_func,
data);
smx_ctx_base_free(context);
}
-void smx_ctx_sysv_stop(smx_context_t context)
-{
- smx_ctx_base_stop(context);
- smx_ctx_sysv_suspend(context);
-}
-
-void smx_ctx_sysv_wrapper(int count, ...)
+void smx_ctx_sysv_wrapper(int first, ...)
{
- uintptr_t ctx_addr = 0;
- va_list ap;
+ union u_ctx_addr ctx_addr;
smx_ctx_sysv_t context;
- int i;
- va_start(ap, count);
- for(i = 0; i < count; i++) {
- ctx_addr <<= 8*sizeof(int);
- ctx_addr |= (uintptr_t)va_arg(ap, int);
+ 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);
}
- va_end(ap);
- context = (smx_ctx_sysv_t)ctx_addr;
+ context = ctx_addr.addr;
(context->super.code) (context->super.argc, context->super.argv);
- smx_ctx_sysv_stop((smx_context_t) context);
+ simix_global->context_factory->stop((smx_context_t) context);
}
-void smx_ctx_sysv_suspend(smx_context_t context)
+static void smx_ctx_sysv_stop_serial(smx_context_t context)
{
- smx_current_context = (smx_context_t)maestro_context;
- int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &((smx_ctx_sysv_t)context)->old_uc);
+ smx_ctx_base_stop(context);
+ smx_ctx_sysv_suspend_serial(context);
+}
- xbt_assert0((rv == 0), "Context swapping failure");
+static void smx_ctx_sysv_suspend_serial(smx_context_t context)
+{
+ /* determine the next context */
+ smx_context_t next_context;
+ unsigned long int i = smx_ctx_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) smx_ctx_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_resume(smx_context_t context)
+static void smx_ctx_sysv_resume_serial(smx_process_t first_process)
{
- smx_current_context = context;
- int rv = swapcontext(&((smx_ctx_sysv_t)context)->old_uc, &((smx_ctx_sysv_t) context)->uc);
+ smx_context_t context = first_process->context;
+ SIMIX_context_set_current(context);
+ swapcontext(&smx_ctx_sysv_maestro_context->uc,
+ &((smx_ctx_sysv_t) context)->uc);
+}
- xbt_assert0((rv == 0), "Context swapping failure");
+static void smx_ctx_sysv_runall_serial(void)
+{
+ if (xbt_dynar_length(simix_global->process_to_run) > 0) {
+ smx_process_t first_process =
+ xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
+ smx_ctx_sysv_process_index = 1;
+
+ /* execute the first process */
+ smx_ctx_sysv_resume_serial(first_process);
+ }
}
-void smx_ctx_sysv_runall(xbt_dynar_t processes)
+static void smx_ctx_sysv_stop_parallel(smx_context_t context)
{
- smx_process_t process;
- unsigned int cursor;
+ smx_ctx_base_stop(context);
+ smx_ctx_sysv_suspend_parallel(context);
+}
- xbt_dynar_foreach(processes, cursor, process) {
- DEBUG2("Schedule item %u of %lu",cursor,xbt_dynar_length(processes));
- smx_ctx_sysv_resume(process->context);
+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(smx_ctx_sysv_parmap);
+ smx_context_t next_context;
+ ucontext_t* next_uc;
+
+ if (next_work != NULL) {
+ /* there is a next process to resume */
+ XBT_DEBUG("Run next process");
+ next_context = next_work->context;
+ next_uc = &((smx_ctx_sysv_t) next_context)->uc;
}
- xbt_dynar_reset(processes);
+ else {
+ /* all processes were run, go to the barrier */
+ XBT_DEBUG("No more processes to run");
+ next_context = (smx_context_t) smx_ctx_sysv_maestro_context;
+ unsigned long worker_id = xbt_parmap_get_worker_id(smx_ctx_sysv_parmap);
+ next_uc = &smx_ctx_sysv_local_maestro_uc[worker_id];
+ }
+
+ SIMIX_context_set_current(next_context);
+ swapcontext(&((smx_ctx_sysv_t) context)->uc, next_uc);
+#endif
}
-void smx_ctx_sysv_resume_parallel(smx_process_t process)
+static void smx_ctx_sysv_resume_parallel(smx_process_t first_process)
{
- smx_context_t context = process->context;
- xbt_os_thread_set_extra_data(context);
- int rv = swapcontext(&((smx_ctx_sysv_t)context)->old_uc, &((smx_ctx_sysv_t) context)->uc);
- xbt_os_thread_set_extra_data(NULL);
+#ifdef CONTEXT_THREADS
+ unsigned long worker_id = xbt_parmap_get_worker_id(smx_ctx_sysv_parmap);
+ ucontext_t* local_maestro_uc = &smx_ctx_sysv_local_maestro_uc[worker_id];
- xbt_assert0((rv == 0), "Context swapping failure");
+ smx_context_t context = first_process->context;
+ SIMIX_context_set_current(context);
+ swapcontext(local_maestro_uc, &((smx_ctx_sysv_t) context)->uc);
+#endif
}
-void smx_ctx_sysv_runall_parallel(xbt_dynar_t processes)
+static void smx_ctx_sysv_runall_parallel(void)
{
- xbt_parmap_apply(parmap, (void_f_pvoid_t)smx_ctx_sysv_resume_parallel, processes);
- xbt_dynar_reset(processes);
+#ifdef CONTEXT_THREADS
+ xbt_parmap_apply(smx_ctx_sysv_parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel,
+ simix_global->process_to_run);
+#endif
}
smx_context_t smx_ctx_sysv_self_parallel(void)
{
- smx_context_t self_context = (smx_context_t) xbt_os_thread_get_extra_data();
- return self_context ? self_context : (smx_context_t) maestro_context;
+ /*smx_context_t self_context = (smx_context_t) xbt_os_thread_get_extra_data();
+ return self_context ? self_context : (smx_context_t) maestro_context;*/
+ return SIMIX_context_get_current();
}
