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#include "threads/threads.h"
#include "threads/mutex.h"
#include "port/unused.h"
#include <stdlib.h> /* for EXIT_SUCCESS, EXIT_FAILURE */
#include <stdio.h> /* for fprintf */
#define USE_MUTEX 1
#define NOF_LOOPS 10
#define NOF_THREADS 10
#if USE_MUTEX
#define NOF_ITERATIONS 100000
#else
#define NOF_ITERATIONS 1000000
#endif
static int counter = 0;
#if USE_MUTEX
static wolf_mutex_t counter_mutex;
#endif
static WOLF_THREAD_RETURN_DECL thread_func( void *thread_data ) {
int i;
for( i = 0; i < NOF_ITERATIONS; i++ ) {
#if USE_MUTEX
wolf_mutex_lock( &counter_mutex );
#endif
counter++;
#if USE_MUTEX
wolf_mutex_unlock( &counter_mutex );
#endif
}
WOLF_UNUSED( thread_data );
WOLF_THREAD_RETURN
}
int main( void ) {
int i;
int j;
wolf_thread_t thread[NOF_THREADS];
wolf_error_t error;
#if USE_MUTEX
error = wolf_mutex_init( &counter_mutex );
if( error != WOLF_OK ) {
fprintf( stderr, "Unable to create mutex: %d\n", error );
return EXIT_FAILURE;
}
#endif
for( j = 0; j < NOF_LOOPS; j++ ) {
for( i = 0; i < NOF_THREADS; i++ ) {
error = wolf_thread_create( &thread[i], thread_func );
if( error != WOLF_OK ) {
fprintf( stderr, "Unable to start thread %d: %d\n", i, error );
return EXIT_FAILURE;
}
printf( "Created thread %d\n", i );
fflush( stdout );
}
for( i = 0; i < NOF_THREADS; i++ ) {
error = wolf_thread_join( &thread[i] );
if( error != WOLF_OK ) {
fprintf( stderr, "Unable to join thread %d: %d\n", i, error );
return EXIT_FAILURE;
}
printf( "Joined thread %d\n", i );
fflush( stdout );
}
printf( "Value of counter: %d\n", counter );
if( counter != ( j + 1 ) * NOF_THREADS * NOF_ITERATIONS ) {
fprintf( stderr, "Counter miscounted, is %d, must %d be!\n",
counter, ( j + 1 ) * NOF_THREADS * NOF_ITERATIONS );
return EXIT_FAILURE;
}
}
#if USE_MUTEX
error = wolf_mutex_destroy( &counter_mutex );
if( error != WOLF_OK ) {
fprintf( stderr, "Unable to destroy mutex: %d\n", error );
return EXIT_FAILURE;
}
#endif
return EXIT_SUCCESS;
}
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