*/
#include <stdint.h>
+#include <stdatomic.h>
#include "cpu.h"
#include "cpu_internal.h"
#include <unistd.h>
#endif
-static int flags, checked;
+static atomic_int cpu_flags = ATOMIC_VAR_INIT(-1);
+
+static int get_cpu_flags(void)
+{
+ if (ARCH_AARCH64)
+ return ff_get_cpu_flags_aarch64();
+ if (ARCH_ARM)
+ return ff_get_cpu_flags_arm();
+ if (ARCH_PPC)
+ return ff_get_cpu_flags_ppc();
+ if (ARCH_X86)
+ return ff_get_cpu_flags_x86();
+ return 0;
+}
void av_force_cpu_flags(int arg){
if ( (arg & ( AV_CPU_FLAG_3DNOW |
arg |= AV_CPU_FLAG_MMX;
}
- flags = arg;
- checked = arg != -1;
+ atomic_store_explicit(&cpu_flags, arg, memory_order_relaxed);
}
int av_get_cpu_flags(void)
{
- if (checked)
- return flags;
-
- if (ARCH_AARCH64)
- flags = ff_get_cpu_flags_aarch64();
- if (ARCH_ARM)
- flags = ff_get_cpu_flags_arm();
- if (ARCH_PPC)
- flags = ff_get_cpu_flags_ppc();
- if (ARCH_X86)
- flags = ff_get_cpu_flags_x86();
-
- checked = 1;
+ int flags = atomic_load_explicit(&cpu_flags, memory_order_relaxed);
+ if (flags == -1) {
+ flags = get_cpu_flags();
+ atomic_store_explicit(&cpu_flags, flags, memory_order_relaxed);
+ }
return flags;
}
void av_set_cpu_flags_mask(int mask)
{
- checked = 0;
- flags = av_get_cpu_flags() & mask;
- checked = 1;
+ atomic_store_explicit(&cpu_flags, get_cpu_flags() & mask,
+ memory_order_relaxed);
}
int av_parse_cpu_flags(const char *s)