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aports/community/libtbb/fix-pthread-create.patch

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Patch-Source: https://github.com/oneapi-src/oneTBB/commit/137c1a88b690acf3525e0f279720ac489ce66481
From 137c1a88b690acf3525e0f279720ac489ce66481 Mon Sep 17 00:00:00 2001
From: Rui Ueyama <ruiu@cs.stanford.edu>
Date: Wed, 26 Oct 2022 04:54:20 -0700
Subject: [PATCH] Retry if pthread_create fails with EAGAIN (#824)
Signed-off-by: Rui Ueyama <ruiu@cs.stanford.edu>
---
src/tbb/rml_thread_monitor.h | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/src/tbb/rml_thread_monitor.h b/src/tbb/rml_thread_monitor.h
index 13b556380..57e9c30b0 100644
--- a/src/tbb/rml_thread_monitor.h
+++ b/src/tbb/rml_thread_monitor.h
@@ -31,6 +31,7 @@
#include <pthread.h>
#include <cstring>
#include <cstdlib>
+#include <time.h>
#else
#error Unsupported platform
#endif
@@ -191,8 +192,25 @@ inline thread_monitor::handle_type thread_monitor::launch( void* (*thread_routin
check(pthread_attr_init( &s ), "pthread_attr_init has failed");
if( stack_size>0 )
check(pthread_attr_setstacksize( &s, stack_size ), "pthread_attr_setstack_size has failed" );
+
+ // pthread_create(2) can spuriously fail with EAGAIN. We retry
+ // max_num_tries times with progressively longer wait times.
pthread_t handle;
- check( pthread_create( &handle, &s, thread_routine, arg ), "pthread_create has failed" );
+ const int max_num_tries = 20;
+ int error = EAGAIN;
+
+ for (int i = 0; i < max_num_tries && error == EAGAIN; i++) {
+ if (i != 0) {
+ // Wait i milliseconds
+ struct timespec ts = {0, i * 1000 * 1000};
+ nanosleep(&ts, NULL);
+ }
+ error = pthread_create(&handle, &s, thread_routine, arg);
+ }
+
+ if (error)
+ handle_perror(error, "pthread_create has failed");
+
check( pthread_attr_destroy( &s ), "pthread_attr_destroy has failed" );
return handle;
}