venus: add vn_gettid helper

Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26179>

src/virtio/vulkan/vn_common.c

@@ -11,7 +11,6 @@
 #include "vn_common.h"
 
 #include <stdarg.h>
-#include <sys/syscall.h>
 
 #include "util/log.h"
 #include "util/os_misc.h"
@@ -139,7 +138,7 @@ vn_watchdog_timeout(const struct vn_watchdog *watchdog)
 static inline void
 vn_watchdog_release(struct vn_watchdog *watchdog)
 {
-   if (syscall(SYS_gettid) == watchdog->tid) {
+   if (vn_gettid() == watchdog->tid) {
       watchdog->tid = 0;
       mtx_unlock(&watchdog->mutex);
    }
@@ -148,7 +147,7 @@ vn_watchdog_release(struct vn_watchdog *watchdog)
 static bool
 vn_watchdog_acquire(struct vn_watchdog *watchdog, bool alive)
 {
-   pid_t tid = syscall(SYS_gettid);
+   pid_t tid = vn_gettid();
    if (!watchdog->tid && tid != watchdog->tid &&
        mtx_trylock(&watchdog->mutex) == thrd_success) {
       /* register as the only waiting thread that monitors the ring. */

src/virtio/vulkan/vn_common.h

@@ -20,6 +20,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/syscall.h>
 #include <vulkan/vulkan.h>
 
 #include "c11/threads.h"
@@ -458,4 +459,14 @@ vn_object_get_id(const void *obj, VkObjectType type)
    }
 }
 
+static inline pid_t
+vn_gettid(void)
+{
+#ifdef ANDROID
+   return gettid();
+#else
+   return syscall(SYS_gettid);
+#endif
+}
+
 #endif /* VN_COMMON_H */