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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /tools/build/feature/test-sync-compare-and-swap.c |
Initial import
Diffstat (limited to 'tools/build/feature/test-sync-compare-and-swap.c')
-rw-r--r-- | tools/build/feature/test-sync-compare-and-swap.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/build/feature/test-sync-compare-and-swap.c b/tools/build/feature/test-sync-compare-and-swap.c new file mode 100644 index 000000000..c34d4ca4a --- /dev/null +++ b/tools/build/feature/test-sync-compare-and-swap.c @@ -0,0 +1,14 @@ +#include <stdint.h> + +volatile uint64_t x; + +int main(int argc, char *argv[]) +{ + uint64_t old, new = argc; + + argv = argv; + do { + old = __sync_val_compare_and_swap(&x, 0, 0); + } while (!__sync_bool_compare_and_swap(&x, old, new)); + return old == new; +} |