ADT
arm-eh
ast-experimental
enum
forall-pointer-decay
jacob/cs343-translation
new-ast-unique-expr
pthread-emulation
qualifiedEnum
Last change
on this file since 6645cda was 525b5ef, checked in by Peter A. Buhr <pabuhr@…>, 6 years ago |
add documentation
|
-
Property mode
set to
100644
|
File size:
835 bytes
|
Line | |
---|
1 | #include <stdbool.h>
|
---|
2 | #include <stdio.h>
|
---|
3 |
|
---|
4 | #include "bench.h"
|
---|
5 |
|
---|
6 | // Does not do a fetch & add. It mimics the cfa protocol to disable interrupts locally, by writing true or false to a
|
---|
7 | // thread_local Boolean. This means the entire protocol is just to "mov" instructions making it extremely cheap.
|
---|
8 |
|
---|
9 | #define thread_local _Thread_local
|
---|
10 |
|
---|
11 | thread_local volatile bool value;
|
---|
12 |
|
---|
13 | void __attribute__((noinline)) do_call() {
|
---|
14 | __atomic_store_n( &value, true, __ATOMIC_RELAXED );
|
---|
15 | __atomic_signal_fence(__ATOMIC_ACQUIRE);
|
---|
16 | asm volatile ("");
|
---|
17 | __atomic_store_n( &value, false, __ATOMIC_RELAXED );
|
---|
18 | __atomic_signal_fence(__ATOMIC_RELEASE);
|
---|
19 | }
|
---|
20 |
|
---|
21 | int main( int argc, char * argv[] ) {
|
---|
22 | BENCH_START()
|
---|
23 | BENCH(
|
---|
24 | for (size_t i = 0; i < times; i++) {
|
---|
25 | do_call();
|
---|
26 | },
|
---|
27 | result
|
---|
28 | )
|
---|
29 | printf( "%g\n", result );
|
---|
30 | }
|
---|
31 |
|
---|
32 | // Local Variables: //
|
---|
33 | // tab-width: 4 //
|
---|
34 | // End: //
|
---|
Note:
See
TracBrowser
for help on using the repository browser.