source:
benchmark/schedint/pthreads.c
@
2606a03
Last change on this file since 2606a03 was 26fd986, checked in by , 5 years ago | |
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File size: 1.0 KB |
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[3eb4541] | 1 | #include <pthread.h> |
2 | #include <stdio.h> | |
3 | ||
4 | #include "bench.h" | |
5 | ||
6 | volatile int go = 0; | |
7 | ||
8 | pthread_mutex_t m; | |
[26fd986] | 9 | pthread_cond_t c; |
[3eb4541] | 10 | |
11 | void __attribute__((noinline)) call() { | |
[26fd986] | 12 | pthread_mutex_lock( &m ); |
13 | pthread_cond_signal( &c ); | |
14 | pthread_mutex_unlock( &m ); | |
[3eb4541] | 15 | } |
16 | ||
[26fd986] | 17 | void __attribute__((noinline)) wait() { |
[3eb4541] | 18 | pthread_mutex_lock(&m); |
19 | go = 1; | |
[26fd986] | 20 | for ( size_t i = 0; i < times; i++ ) { |
21 | pthread_cond_wait( &c, &m ); | |
22 | } | |
23 | go = 0; | |
24 | pthread_mutex_unlock( &m ); | |
25 | } | |
26 | ||
27 | void * thread_main( __attribute__((unused)) void * arg ) { | |
28 | while ( go == 0 ) { sched_yield(); } // waiter must start first | |
29 | // barging for lock acquire => may not execute N times | |
[3eb4541] | 30 | BENCH( |
[26fd986] | 31 | while ( go == 1 ) { call(); }, |
[3eb4541] | 32 | result |
33 | ) | |
[b4107c8] | 34 | printf( "%g\n", result ); |
[3eb4541] | 35 | return NULL; |
36 | } | |
37 | ||
[b4107c8] | 38 | int main( int argc, char * argv[] ) { |
39 | BENCH_START() | |
[3eb4541] | 40 | pthread_t thread; |
[26fd986] | 41 | if ( pthread_create( &thread, NULL, thread_main, NULL ) < 0 ) { |
[3eb4541] | 42 | perror( "failure" ); |
43 | return 1; | |
44 | } | |
45 | wait(); | |
[26fd986] | 46 | if ( pthread_join( thread, NULL ) < 0 ) { |
[3eb4541] | 47 | perror( "failure" ); |
48 | return 1; | |
49 | } | |
[dc33b5b] | 50 | } |
[b4107c8] | 51 | |
52 | // Local Variables: // | |
53 | // tab-width: 4 // | |
54 | // End: // |
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