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gallium/u_cpu_detect: fix a race condition on initialization

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Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Marek Olšák 2018-09-05 19:15:56 -04:00
parent 8396043f30
commit a84fd58f48
1 changed files with 11 additions and 9 deletions
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20
src/gallium/auxiliary/util/u_cpu_detect.c
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@ -36,6 +36,7 @@
#include "u_debug.h"
#include "u_cpu_detect.h"
#include "c11/threads.h"
#if defined(PIPE_ARCH_PPC)
#if defined(PIPE_OS_APPLE)
@ -366,14 +367,9 @@ check_os_arm_support(void)
}
#endif /* PIPE_ARCH_ARM */
void
util_cpu_detect(void)
static void
util_cpu_detect_once(void)
{
static boolean util_cpu_detect_initialized = FALSE;
if(util_cpu_detect_initialized)
return;
memset(&util_cpu_caps, 0, sizeof util_cpu_caps);
/* Count the number of CPUs in system */
@ -561,6 +557,12 @@ util_cpu_detect(void)
debug_printf("util_cpu_caps.has_avx512vbmi = %u\n", util_cpu_caps.has_avx512vbmi);
}
#endif
util_cpu_detect_initialized = TRUE;
}
static once_flag cpu_once_flag = ONCE_FLAG_INIT;
void
util_cpu_detect(void)
{
call_once(&cpu_once_flag, util_cpu_detect_once);
}