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gthreadpool: Cleanup thread pool unused threads

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This requires different phases getting involved:
 * early: Signal all the unused pool threads, and change unused
   limits to zero, so no new unused pool threads.
 * default: Join all unused pool threads.
 * late: Free up the unused thread queue

https://bugzilla.gnome.org/show_bug.cgi?id=711744
This commit is contained in:
Stef Walter
2013-11-10 00:16:28 +01:00
parent 2361bf79ca
commit c9d6518969
1 changed files with 47 additions and 0 deletions
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47
glib/gthreadpool.c
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@@ -30,6 +30,7 @@
#include "gasyncqueue.h"
#include "gasyncqueueprivate.h"
#include "gcleanup.h"
#include "gmain.h"
#include "gtestutils.h"
#include "gtimer.h"
@@ -137,6 +138,20 @@ g_thread_pool_queue_push_unlocked (GRealThreadPool *pool,
g_async_queue_push_unlocked (pool->queue, data);
}
static void
ref_and_join_thread (GThread *thread)
{
/*
* This is called as a cleanup function, but removed before the thread
* is destroyed. So we know the thread is valid here.
*
* g_thread_join() unrefs, so we need to first ref the thread, in order
* to avoid use/after free elsewhere.
*/
g_thread_ref (thread);
g_thread_join (thread);
}
static GRealThreadPool*
g_thread_pool_wait_for_new_pool (void)
{
@@ -146,6 +161,7 @@ g_thread_pool_wait_for_new_pool (void)
gint local_max_idle_time;
gint last_wakeup_thread_serial;
gboolean have_relayed_thread_marker = FALSE;
gpointer cleanup;
local_max_unused_threads = g_atomic_int_get (&max_unused_threads);
local_max_idle_time = g_atomic_int_get (&max_idle_time);
@@ -153,6 +169,14 @@ g_thread_pool_wait_for_new_pool (void)
g_atomic_int_inc (&unused_threads);
/*
* While in the unused thread queue, this thread will need cleanup.
* Cleaned up again below.
*/
cleanup = g_cleanup_push (G_CLEANUP_SCOPE, G_CLEANUP_PHASE_DEFAULT,
(GCleanupFunc)ref_and_join_thread, g_thread_self ());
do
{
if (g_atomic_int_get (&unused_threads) >= local_max_unused_threads)
@@ -221,6 +245,8 @@ g_thread_pool_wait_for_new_pool (void)
}
while (pool == wakeup_thread_marker);
g_cleanup_remove (cleanup);
g_atomic_int_add (&unused_threads, -1);
return pool;
@@ -422,6 +448,12 @@ g_thread_pool_start_thread (GRealThreadPool *pool,
return TRUE;
}
static void
stop_all_unused_threads (void)
{
g_thread_pool_set_max_unused_threads (0);
}
/**
* g_thread_pool_new:
* @func: a function to execute in the threads of the new thread pool
@@ -488,7 +520,22 @@ g_thread_pool_new (GFunc func,
G_LOCK (init);
if (!unused_thread_queue)
{
unused_thread_queue = g_async_queue_new ();
/* First stop having unused threads in early phase */
G_CLEANUP_FUNC_IN (stop_all_unused_threads, G_CLEANUP_PHASE_EARLY);
/*
* Next any still outstanding unused threads get g_thread_join()'d during
* G_CLEANUP_PHASE_DEFAULT. See g_thread_pool_wait_for_new_pool().
*
* Lastly at the very end destroy the unused_thread_queue. We can do this
* very late, as it owns all its own mutexes and doesn't have an item_free_func
* callback.
*/
G_CLEANUP_IN (unused_thread_queue, g_async_queue_unref, G_CLEANUP_PHASE_GRAVEYARD);
}
G_UNLOCK (init);
if (retval->pool.exclusive)