[PATCH 3/5] Avoid use of pthread_cancel by introducing an exit flag

[Jeevaka Prabu Badrappan]

Android build fails due to pthread_cancel unavailability.
Replace pthread_cancel with thread exit based on an exit flag.

Signed-off-by: Jeevaka Prabu Badrappan <jeevaka.badrappan at intel.com>
---
 lib/igt_dummyload.c | 6 +++---
 lib/igt_dummyload.h | 2 ++
 lib/xe/xe_spin.c    | 2 +-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/igt_dummyload.c b/lib/igt_dummyload.c
index 3cf80b762..38249afb7 100644
--- a/lib/igt_dummyload.c
+++ b/lib/igt_dummyload.c
@@ -530,7 +530,7 @@ static void *timer_thread(void *data)
 	/* Wait until we see the timer fire, or we get cancelled */
 	do {
 		read(spin->timerfd, &overruns, sizeof(overruns));
-	} while (!overruns);
+	} while (!overruns && !spin->exit_thread);
 
 	igt_spin_end(spin);
 	return NULL;
@@ -565,7 +565,7 @@ void igt_spin_set_timeout(igt_spin_t *spin, int64_t ns)
 	timerfd = timerfd_create(CLOCK_MONOTONIC, 0);
 	igt_assert(timerfd >= 0);
 	spin->timerfd = timerfd;
-
+	spin->exit_thread = false;
 	pthread_attr_init(&attr);
 	pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
 	pthread_attr_setschedpolicy(&attr, SCHED_FIFO);
@@ -631,7 +631,7 @@ void igt_spin_end(igt_spin_t *spin)
 static void __igt_spin_free(int fd, igt_spin_t *spin)
 {
 	if (spin->timerfd >= 0) {
-		pthread_cancel(spin->timer_thread);
+		spin->exit_thread = true;
 		igt_assert(pthread_join(spin->timer_thread, NULL) == 0);
 		close(spin->timerfd);
 	}
diff --git a/lib/igt_dummyload.h b/lib/igt_dummyload.h
index b771011af..07b21227d 100644
--- a/lib/igt_dummyload.h
+++ b/lib/igt_dummyload.h
@@ -26,6 +26,7 @@
 #define __IGT_DUMMYLOAD_H__
 
 #include <stdint.h>
+#include <stdatomic.h>
 #include <time.h>
 
 #include "drmtest.h"
@@ -75,6 +76,7 @@ typedef struct igt_spin {
 
 	struct timespec last_signal;
 	pthread_t timer_thread;
+	atomic_bool exit_thread;
 	int timerfd;
 
 	int out_fence;
diff --git a/lib/xe/xe_spin.c b/lib/xe/xe_spin.c
index a92903b6b..2fb688179 100644
--- a/lib/xe/xe_spin.c
+++ b/lib/xe/xe_spin.c
@@ -264,7 +264,7 @@ void xe_spin_free(int fd, struct igt_spin *spin)
 	igt_assert(spin->driver == INTEL_DRIVER_XE);
 
 	if (spin->timerfd >= 0) {
-		pthread_cancel(spin->timer_thread);
+		spin->exit_thread = true;
 		igt_assert(pthread_join(spin->timer_thread, NULL) == 0);
 		close(spin->timerfd);
 	}
-- 
2.49.0