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Set thread names on Linux

This is using the Linux-only prctl(PR_SET_NAME, …) call, because glibc’s
pthread_setname_np() is doing exactly the same call so there is no
reason to use it instead, as it isn’t any more portable.

I don’t have any other OS to test this on, but if you want to add one
just add an #else defined(__YOUR_OS__) before the #else in thread.h.

--- a/src/thread.h

+++ b/src/thread.h

@@ -128,4 +128,20 @@

 #endif

+/* Thread naming support */

+

+#ifdef __linux__

+

+#include <sys/prctl.h>

+

+static inline void dav1d_set_thread_name(const char* name) {

+    prctl(PR_SET_NAME, name);

+}

+

+#else

+

+#define dav1d_set_thread_name(name)

+

+#endif

+

 #endif /* DAV1D_SRC_THREAD_H */

--- a/src/thread_task.c

+++ b/src/thread_task.c

@@ -32,6 +32,7 @@

 void *dav1d_frame_task(void *const data) {

     Dav1dFrameContext *const f = data;

+    dav1d_set_thread_name("dav1d-frame");

     pthread_mutex_lock(&f->frame_thread.td.lock);

     for (;;) {

         while (!f->n_tile_data && !f->frame_thread.die) {

@@ -61,6 +62,8 @@

     const Dav1dFrameContext *const f = t->f;

     const int tile_thread_idx = (int) (t - f->tc);

     const uint64_t mask = 1ULL << tile_thread_idx;

+

+    dav1d_set_thread_name("dav1d-tile");

     for (;;) {

         pthread_mutex_lock(&fttd->lock);