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ARM64: DTS: Add rk3399-firefly uart4 device, node as /dev/ttyS1
[firefly-linux-kernel-4.4.55.git]
/
tools
/
build
/
feature
/
test-sync-compare-and-swap.c
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#include <stdint.h>
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volatile uint64_t x;
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int main(int argc, char *argv[])
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{
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uint64_t old, new = argc;
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argv = argv;
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do {
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old = __sync_val_compare_and_swap(&x, 0, 0);
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} while (!__sync_bool_compare_and_swap(&x, old, new));
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return old == new;
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}