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#include "executor.h"
struct Executor
{
gboolean quitting;
GMutex * mutex;
GCond * new_job_cond;
GCond * idle_cond;
GCond * exit_cond;
GQueue * jobs;
int n_threads;
int n_idle_threads;
int n_exited_threads;
};
static gpointer executor_thread (gpointer);
static void
executor_lock (Executor *executor)
{
g_mutex_lock (executor->mutex);
}
static void
executor_unlock (Executor *executor)
{
g_mutex_unlock (executor->mutex);
}
Executor *
executor_new (guint n_threads)
{
Executor *executor;
int i;
g_return_val_if_fail (n_threads > 0, NULL);
if (!g_thread_supported())
g_thread_init (NULL);
executor = g_new0 (Executor, 1);
executor->mutex = g_mutex_new ();
executor->jobs = g_queue_new ();
executor->new_job_cond = g_cond_new ();
executor->idle_cond = g_cond_new ();
executor->exit_cond = g_cond_new ();
executor->n_idle_threads = 0;
executor->n_exited_threads = 0;
executor->quitting = FALSE;
executor->n_threads = n_threads;
executor_lock (executor);
for (i = 0; i < n_threads; ++i)
g_thread_create (executor_thread, executor, TRUE, NULL);
executor_unlock (executor);
return executor;
}
static guint
executor_n_jobs (Executor *executor)
{
g_assert (g_queue_get_length (executor->jobs) % 2 == 0);
return (g_queue_get_length (executor->jobs)) / 2;
}
/* Wait until all previously submitted jobs have finished */
void
executor_sync (Executor *executor)
{
executor_lock (executor);
g_cond_broadcast (executor->new_job_cond);
while (!(executor->n_idle_threads == executor->n_threads &&
executor_n_jobs (executor) == 0))
{
g_cond_wait (executor->idle_cond, executor->mutex);
}
executor_unlock (executor);
}
void
executor_free (Executor *executor)
{
executor_lock (executor);
executor->quitting = TRUE;
g_cond_broadcast (executor->new_job_cond);
while (executor->n_exited_threads != executor->n_threads)
g_cond_wait (executor->exit_cond, executor->mutex);
executor_unlock (executor);
while (!g_queue_is_empty (executor->jobs))
g_queue_pop_head (executor->jobs);
g_mutex_free (executor->mutex);
g_cond_free (executor->new_job_cond);
g_cond_free (executor->idle_cond);
g_cond_free (executor->exit_cond);
g_queue_free (executor->jobs);
}
void
executor_add_job (Executor *exe,
ExecutorJob job,
gpointer data)
{
executor_lock (exe);
g_queue_push_tail (exe->jobs, job);
g_queue_push_tail (exe->jobs, data);
g_cond_signal (exe->new_job_cond);
executor_unlock (exe);
}
static gpointer
executor_thread (gpointer data)
{
Executor *executor = data;
executor_lock (executor);
while (!executor->quitting)
{
if (!executor_n_jobs (executor))
{
executor->n_idle_threads++;
g_cond_signal (executor->idle_cond);
g_cond_wait (executor->new_job_cond, executor->mutex);
executor->n_idle_threads--;
}
if (executor->quitting)
break;
if (executor_n_jobs (executor))
{
ExecutorJob job;
gpointer data;
job = g_queue_pop_head (executor->jobs);
data = g_queue_pop_head (executor->jobs);
executor_unlock (executor);
job (data);
executor_lock (executor);
}
}
executor->n_exited_threads++;
g_cond_signal (executor->exit_cond);
executor_unlock (executor);
return NULL;
}
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