source: benchmark/basic/tls_fetch_add.c@ dc708c1

#include <stdbool.h>
#include <stdio.h>

#include "bench.h"

// Does not do a fetch & add. It mimics the cfa protocol to disable interrupts locally, by writing true or false to a
// thread_local Boolean. This means the entire protocol is just to "mov" instructions making it extremely cheap.

_Thread_local volatile bool value;

void __attribute__((noinline)) do_call() {
        __atomic_store_n( &value, true, __ATOMIC_RELAXED );
        __atomic_signal_fence(__ATOMIC_ACQUIRE);
        asm volatile ("");
        __atomic_store_n( &value, false, __ATOMIC_RELAXED );
        __atomic_signal_fence(__ATOMIC_RELEASE);
}

int main( int argc, char * argv[] ) {
        BENCH_START()
        BENCH(
                for (size_t i = 0; i < times; i++) {
                        do_call();
                },
                result
        )
        printf( "%g\n", result );
}

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