#include <semaphore.h>
#include <errno.h>
#include <unistd.h>
+#include <sys/time.h>
/* work around a dlopen issue (bug #75390), undefs to avoid warnings with redefinitions */
#undef PACKAGE_BUGREPORT
#include "include/libgc-mono-debugger.h"
#endif
+#ifdef NACL
+int nacl_park_threads_now = 0;
+pthread_t nacl_thread_parker = -1;
+
+int nacl_thread_parked[MAX_NACL_GC_THREADS];
+int nacl_thread_used[MAX_NACL_GC_THREADS];
+int nacl_thread_parking_inited = 0;
+int nacl_num_gc_threads = 0;
+pthread_mutex_t nacl_thread_alloc_lock = PTHREAD_MUTEX_INITIALIZER;
+__thread int nacl_thread_idx = -1;
+__thread GC_thread nacl_gc_thread_self = NULL;
+#endif
+
#if DEBUG_THREADS
#ifndef NSIG
# endif
#endif
+#ifndef NACL
void GC_print_sig_mask()
{
sigset_t blocked;
}
GC_printf0("\n");
}
-
+#endif /* NACL */
#endif
/* Remove the signals that we want to allow in thread stopping */
static void _GC_suspend_handler(int sig)
{
+#ifndef NACL
int dummy;
pthread_t my_thread = pthread_self();
GC_thread me;
#if DEBUG_THREADS
GC_printf1("Continuing 0x%lx\n", my_thread);
#endif
+
+#endif /* NACL */
}
void GC_suspend_handler(int sig)
# else
GC_push_all_stack(lo, hi);
# endif
+# ifdef NACL
+ /* Push reg_storage as roots, this will cover the reg context */
+ GC_push_all_stack(p -> stop_info.reg_storage, p -> stop_info.reg_storage + NACL_GC_REG_STORAGE_SIZE);
+# endif
# ifdef IA64
# if DEBUG_THREADS
GC_printf3("Reg stack for thread 0x%lx = [%lx,%lx)\n",
/* were sent. */
int GC_suspend_all()
{
+#ifndef NACL
int n_live_threads = 0;
int i;
GC_thread p;
}
}
return n_live_threads;
+#else /* NACL */
+ return 0;
+#endif
}
/* Caller holds allocation lock. */
static void pthread_stop_world()
{
+#ifndef NACL
int i;
int n_live_threads;
int code;
GC_printf1("World stopped from 0x%lx\n", pthread_self());
#endif
GC_stopping_thread = 0; /* debugging only */
+#else /* NACL */
+ GC_thread p;
+ int i;
+
+ #if DEBUG_THREADS
+ GC_printf1("pthread_stop_world: num_threads %d\n", nacl_num_gc_threads - 1);
+ #endif
+ nacl_thread_parker = pthread_self();
+ nacl_park_threads_now = 1;
+
+ while (1) {
+ #define NACL_PARK_WAIT_NANOSECONDS 100000
+ int num_threads_parked = 0;
+ struct timespec ts;
+ int num_used = 0;
+ /* Check the 'parked' flag for each thread the GC knows about */
+ for (i = 0; i < MAX_NACL_GC_THREADS && num_used < nacl_num_gc_threads; i++) {
+ if (nacl_thread_used[i] == 1) {
+ num_used++;
+ if (nacl_thread_parked[i] == 1) {
+ num_threads_parked++;
+ }
+ }
+ }
+ /* -1 for the current thread */
+ if (num_threads_parked >= nacl_num_gc_threads - 1)
+ break;
+ ts.tv_sec = 0;
+ ts.tv_nsec = NACL_PARK_WAIT_NANOSECONDS;
+ #if DEBUG_THREADS
+ GC_printf1("sleeping waiting for %d threads to park...\n", nacl_num_gc_threads - num_threads_parked - 1);
+ #endif
+ nanosleep(&ts, 0);
+ }
+
+#endif /* NACL */
}
+
+#ifdef NACL
+
+#if __x86_64__
+
+#define NACL_STORE_REGS() \
+ do { \
+ asm("push %rbx");\
+ asm("push %rbp");\
+ asm("push %r12");\
+ asm("push %r13");\
+ asm("push %r14");\
+ asm("push %r15");\
+ asm("mov %%esp, %0" : "=m" (nacl_gc_thread_self->stop_info.stack_ptr));\
+ memcpy(nacl_gc_thread_self->stop_info.reg_storage, nacl_gc_thread_self->stop_info.stack_ptr, NACL_GC_REG_STORAGE_SIZE * sizeof(ptr_t));\
+ asm("add $48, %esp");\
+ asm("add %r15, %rsp");\
+ } while (0)
+
+#elif __i386__
+
+#define NACL_STORE_REGS() \
+ do { \
+ asm("push %ebx");\
+ asm("push %ebp");\
+ asm("push %esi");\
+ asm("push %edi");\
+ asm("mov %%esp, %0" : "=m" (nacl_gc_thread_self->stop_info.stack_ptr));\
+ memcpy(nacl_gc_thread_self->stop_info.reg_storage, nacl_gc_thread_self->stop_info.stack_ptr, NACL_GC_REG_STORAGE_SIZE * sizeof(ptr_t));\
+ asm("add $16, %esp");\
+ } while (0)
+
+#endif
+
+void nacl_pre_syscall_hook()
+{
+ int local_dummy = 0;
+ if (nacl_thread_idx != -1) {
+ NACL_STORE_REGS();
+ nacl_gc_thread_self->stop_info.stack_ptr = (ptr_t)(&local_dummy);
+ nacl_thread_parked[nacl_thread_idx] = 1;
+ }
+}
+
+void nacl_post_syscall_hook()
+{
+ /* Calling __nacl_suspend_thread_if_needed() right away should guarantee we don't mutate the GC set. */
+ __nacl_suspend_thread_if_needed();
+ if (nacl_thread_idx != -1) {
+ nacl_thread_parked[nacl_thread_idx] = 0;
+ }
+}
+
+void __nacl_suspend_thread_if_needed() {
+ if (nacl_park_threads_now) {
+ pthread_t self = pthread_self();
+ int local_dummy = 0;
+ /* Don't try to park the thread parker. */
+ if (nacl_thread_parker == self)
+ return;
+
+ /* This can happen when a thread is created */
+ /* outside of the GC system (wthread mostly). */
+ if (nacl_thread_idx < 0)
+ return;
+
+ /* If it was already 'parked', we're returning from a syscall, */
+ /* so don't bother storing registers again, the GC has a set. */
+ if (!nacl_thread_parked[nacl_thread_idx]) {
+ NACL_STORE_REGS();
+ nacl_gc_thread_self->stop_info.stack_ptr = (ptr_t)(&local_dummy);
+ }
+ nacl_thread_parked[nacl_thread_idx] = 1;
+ while (nacl_park_threads_now)
+ ; /* spin */
+ nacl_thread_parked[nacl_thread_idx] = 0;
+
+ /* Clear out the reg storage for next suspend. */
+ memset(nacl_gc_thread_self->stop_info.reg_storage, 0, NACL_GC_REG_STORAGE_SIZE * sizeof(ptr_t));
+ }
+}
+
+#endif /* NACL */
+
/* Caller holds allocation lock. */
void GC_stop_world()
{
/* the world stopped. */
static void pthread_start_world()
{
+#ifndef NACL
pthread_t my_thread = pthread_self();
register int i;
register GC_thread p;
#if DEBUG_THREADS
GC_printf0("World started\n");
#endif
+#else /* NACL */
+# if DEBUG_THREADS
+ GC_printf0("World starting\n");
+# endif
+ nacl_park_threads_now = 0;
+#endif /* NACL */
}
void GC_start_world()
}
static void pthread_stop_init() {
+#ifndef NACL
struct sigaction act;
if (sem_init(&GC_suspend_ack_sem, 0, 0) != 0)
GC_printf0("Will retry suspend signal if necessary.\n");
}
# endif
+#endif /* NACL */
}
/* We hold the allocation lock. */
projects / mono.git / blobdiff