[PATCH 15/33] kvm tools: threadpool exit routine

[Sasha Levin <levinsasha928@xxxxxxxxx>]

Add an exit function for the threadpool which will stop all running threads in the
pool. Also clean up the init code a bit.

Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
 tools/kvm/builtin-run.c            | 11 ++++++++++-
 tools/kvm/include/kvm/threadpool.h |  3 ++-
 tools/kvm/util/threadpool.c        | 33 +++++++++++++++++++++++++++++----
 3 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/tools/kvm/builtin-run.c b/tools/kvm/builtin-run.c
index b4da06e..d83917f 100644
--- a/tools/kvm/builtin-run.c
+++ b/tools/kvm/builtin-run.c
@@ -1216,7 +1216,12 @@ static int kvm_cmd_run_init(int argc, const char **argv)
 		}
 	}
 
-	thread_pool__init(nr_online_cpus);
+	r = thread_pool__init(kvm);
+	if (r < 0) {
+		pr_err("thread_pool__init() failed with error %d\n", r);
+		goto fail;
+	}
+
 fail:
 	return r;
 }
@@ -1301,6 +1306,10 @@ static void kvm_cmd_run_exit(int guest_ret)
 	if (r < 0)
 		pr_warning("pci__exit() failed with error %d\n", r);
 
+	r = thread_pool__exit(kvm);
+	if (r < 0)
+		pr_warning("thread_pool__exit() failed with error %d\n", r);
+
 	r = kvm__exit(kvm);
 	if (r < 0)
 		pr_warning("pci__exit() failed with error %d\n", r);
diff --git a/tools/kvm/include/kvm/threadpool.h b/tools/kvm/include/kvm/threadpool.h
index 768239f..abe46ea 100644
--- a/tools/kvm/include/kvm/threadpool.h
+++ b/tools/kvm/include/kvm/threadpool.h
@@ -30,7 +30,8 @@ static inline void thread_pool__init_job(struct thread_pool__job *job, struct kv
 	};
 }
 
-int thread_pool__init(unsigned long thread_count);
+int thread_pool__init(struct kvm *kvm);
+int thread_pool__exit(struct kvm *kvm);
 
 void thread_pool__do_job(struct thread_pool__job *job);
 
diff --git a/tools/kvm/util/threadpool.c b/tools/kvm/util/threadpool.c
index bafbcd7..6c7566d 100644
--- a/tools/kvm/util/threadpool.c
+++ b/tools/kvm/util/threadpool.c
@@ -14,6 +14,7 @@ static LIST_HEAD(head);
 
 static pthread_t	*threads;
 static long		threadcount;
+static bool		running;
 
 static struct thread_pool__job *thread_pool__job_pop_locked(void)
 {
@@ -76,15 +77,16 @@ static void *thread_pool__threadfunc(void *param)
 {
 	pthread_cleanup_push(thread_pool__threadfunc_cleanup, NULL);
 
-	for (;;) {
+	while (running) {
 		struct thread_pool__job *curjob;
 
 		mutex_lock(&job_mutex);
-		while ((curjob = thread_pool__job_pop_locked()) == NULL)
+		while (running && (curjob = thread_pool__job_pop_locked()) == NULL)
 			pthread_cond_wait(&job_cond, &job_mutex);
 		mutex_unlock(&job_mutex);
 
-		thread_pool__handle_job(curjob);
+		if (running)
+			thread_pool__handle_job(curjob);
 	}
 
 	pthread_cleanup_pop(0);
@@ -116,9 +118,12 @@ static int thread_pool__addthread(void)
 	return res;
 }
 
-int thread_pool__init(unsigned long thread_count)
+int thread_pool__init(struct kvm *kvm)
 {
 	unsigned long i;
+	unsigned int thread_count = sysconf(_SC_NPROCESSORS_ONLN);
+
+	running = true;
 
 	for (i = 0; i < thread_count; i++)
 		if (thread_pool__addthread() < 0)
@@ -127,6 +132,26 @@ int thread_pool__init(unsigned long thread_count)
 	return i;
 }
 
+int thread_pool__exit(struct kvm *kvm)
+{
+	int i;
+	void *NUL = NULL;
+
+	running = false;
+
+	for (i = 0; i < threadcount; i++) {
+		mutex_lock(&job_mutex);
+		pthread_cond_signal(&job_cond);
+		mutex_unlock(&job_mutex);
+	}
+
+	for (i = 0; i < threadcount; i++) {
+		pthread_join(threads[i], NUL);
+	}
+
+	return 0;
+}
+
 void thread_pool__do_job(struct thread_pool__job *job)
 {
 	struct thread_pool__job *jobinfo = job;
-- 
1.7.12

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