*
* Copyright (C) 2015 Xamarin Inc
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License 2.0 as published by the Free Software Foundation;
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License 2.0 along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include "config.h"
#include "mono/utils/mono-threads.h"
#endif
+#define MAX_NUM_THREADS 8
+
static mono_mutex_t lock;
static mono_cond_t work_cond;
static mono_cond_t done_cond;
-static MonoNativeThreadId thread;
+static int threads_num = 0;
+static MonoNativeThreadId threads [MAX_NUM_THREADS];
/* Only accessed with the lock held. */
static SgenPointerQueue job_queue;
static SgenThreadPoolThreadInitFunc thread_init_func;
static SgenThreadPoolIdleJobFunc idle_job_func;
static SgenThreadPoolContinueIdleJobFunc continue_idle_job_func;
+static SgenThreadPoolShouldWorkFunc should_work_func;
+
+static volatile gboolean threadpool_shutdown;
+static volatile int threads_finished = 0;
enum {
STATE_WAITING,
get_job_and_set_in_progress (void)
{
for (size_t i = 0; i < job_queue.next_slot; ++i) {
- SgenThreadPoolJob *job = job_queue.data [i];
+ SgenThreadPoolJob *job = (SgenThreadPoolJob *)job_queue.data [i];
if (job->state == STATE_WAITING) {
job->state = STATE_IN_PROGRESS;
return job;
}
static gboolean
-continue_idle_job (void)
+continue_idle_job (void *thread_data)
{
if (!continue_idle_job_func)
return FALSE;
- return continue_idle_job_func ();
+ return continue_idle_job_func (thread_data);
+}
+
+static gboolean
+should_work (void *thread_data)
+{
+ if (!should_work_func)
+ return TRUE;
+ return should_work_func (thread_data);
}
static mono_native_thread_return_t
mono_os_mutex_lock (&lock);
for (;;) {
+ gboolean do_idle;
+ SgenThreadPoolJob *job;
+
+ if (!should_work (thread_data)) {
+ mono_os_cond_wait (&work_cond, &lock);
+ continue;
+ }
/*
* It's important that we check the continue idle flag with the lock held.
* Suppose we didn't check with the lock held, and the result is FALSE. The
* main thread might then set continue idle and signal us before we can take
* the lock, and we'd lose the signal.
*/
- gboolean do_idle = continue_idle_job ();
- SgenThreadPoolJob *job = get_job_and_set_in_progress ();
+ do_idle = continue_idle_job (thread_data);
+ job = get_job_and_set_in_progress ();
- if (!job && !do_idle) {
+ if (!job && !do_idle && !threadpool_shutdown) {
/*
* pthread_cond_wait() can return successfully despite the condition
* not being signalled, so we have to run this in a loop until we
* have to broadcast.
*/
mono_os_cond_signal (&done_cond);
- } else {
- SGEN_ASSERT (0, do_idle, "Why did we unlock if we still have to wait for idle?");
+ } else if (do_idle) {
SGEN_ASSERT (0, idle_job_func, "Why do we have idle work when there's no idle job function?");
do {
idle_job_func (thread_data);
- do_idle = continue_idle_job ();
+ do_idle = continue_idle_job (thread_data);
} while (do_idle && !job_queue.next_slot);
mono_os_mutex_lock (&lock);
if (!do_idle)
mono_os_cond_signal (&done_cond);
+ } else {
+ SGEN_ASSERT (0, threadpool_shutdown, "Why did we unlock if no jobs and not shutting down?");
+ mono_os_mutex_lock (&lock);
+ threads_finished++;
+ mono_os_cond_signal (&done_cond);
+ mono_os_mutex_unlock (&lock);
+ return 0;
}
}
}
void
-sgen_thread_pool_init (int num_threads, SgenThreadPoolThreadInitFunc init_func, SgenThreadPoolIdleJobFunc idle_func, SgenThreadPoolContinueIdleJobFunc continue_idle_func, void **thread_datas)
+sgen_thread_pool_init (int num_threads, SgenThreadPoolThreadInitFunc init_func, SgenThreadPoolIdleJobFunc idle_func, SgenThreadPoolContinueIdleJobFunc continue_idle_func, SgenThreadPoolShouldWorkFunc should_work_func_p, void **thread_datas)
{
- SGEN_ASSERT (0, num_threads == 1, "We only support 1 thread pool thread for now.");
+ int i;
+
+ threads_num = (num_threads < MAX_NUM_THREADS) ? num_threads : MAX_NUM_THREADS;
mono_os_mutex_init (&lock);
mono_os_cond_init (&work_cond);
thread_init_func = init_func;
idle_job_func = idle_func;
continue_idle_job_func = continue_idle_func;
+ should_work_func = should_work_func_p;
+
+ for (i = 0; i < threads_num; i++)
+ mono_native_thread_create (&threads [i], thread_func, thread_datas ? thread_datas [i] : NULL);
+}
+
+void
+sgen_thread_pool_shutdown (void)
+{
+ if (!threads_num)
+ return;
- mono_native_thread_create (&thread, thread_func, thread_datas ? thread_datas [0] : NULL);
+ mono_os_mutex_lock (&lock);
+ threadpool_shutdown = TRUE;
+ mono_os_cond_broadcast (&work_cond);
+ while (threads_finished < threads_num)
+ mono_os_cond_wait (&done_cond, &lock);
+ mono_os_mutex_unlock (&lock);
+
+ mono_os_mutex_destroy (&lock);
+ mono_os_cond_destroy (&work_cond);
+ mono_os_cond_destroy (&done_cond);
}
SgenThreadPoolJob*
sgen_thread_pool_job_alloc (const char *name, SgenThreadPoolJobFunc func, size_t size)
{
- SgenThreadPoolJob *job = sgen_alloc_internal_dynamic (size, INTERNAL_MEM_THREAD_POOL_JOB, TRUE);
+ SgenThreadPoolJob *job = (SgenThreadPoolJob *)sgen_alloc_internal_dynamic (size, INTERNAL_MEM_THREAD_POOL_JOB, TRUE);
job->name = name;
job->size = size;
job->state = STATE_WAITING;
mono_os_mutex_lock (&lock);
sgen_pointer_queue_add (&job_queue, job);
- /*
- * FIXME: We could check whether there is a job in progress. If there is, there's
- * no need to signal the condition, at least as long as we have only one thread.
- */
mono_os_cond_signal (&work_cond);
mono_os_mutex_unlock (&lock);
mono_os_mutex_lock (&lock);
- if (continue_idle_job_func ())
- mono_os_cond_signal (&work_cond);
+ if (continue_idle_job_func (NULL))
+ mono_os_cond_broadcast (&work_cond);
mono_os_mutex_unlock (&lock);
}
mono_os_mutex_lock (&lock);
- while (continue_idle_job_func ())
+ while (continue_idle_job_func (NULL))
mono_os_cond_wait (&done_cond, &lock);
mono_os_mutex_unlock (&lock);
mono_os_mutex_unlock (&lock);
}
-gboolean
+/* Return 0 if is not a thread pool thread or the thread number otherwise */
+int
sgen_thread_pool_is_thread_pool_thread (MonoNativeThreadId some_thread)
{
- return some_thread == thread;
+ int i;
+
+ for (i = 0; i < threads_num; i++) {
+ if (some_thread == threads [i])
+ return i + 1;
+ }
+
+ return 0;
}
#endif
projects / mono.git / blobdiff