141 lines
2.4 KiB
C
141 lines
2.4 KiB
C
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/* BeginSourceFile more_steps.c
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This file creates a lot of threads which then execute
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in parallel, so that wdb can be tested on handling
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simultaneous thread events.
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To compile:
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cc -Ae +DA1.0 -g -o more_steps -lpthread more_steps.c
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To run:
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more_threads
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include <pthread.h>
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#define TRUE 1
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#define FALSE 0
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#define N_THREADS 3
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#define PHASES 3
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typedef enum {
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ZERO,
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ONE,
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TWO,
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THREE
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} phase_t;
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/* Uncomment to turn on debugging output */
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/* #define DEBUG */
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/* Locks.
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*/
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int lock_one; /* Main W, others R */
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int lock_two; /* ditto */
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int lock_end[ N_THREADS ]; /* Main R, others R[i] */
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int phase[ N_THREADS ];
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/* Routine for each thread to run.
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*/
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void *spin( vp )
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void * vp;
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{
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int me = (int) vp;
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int i;
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lock_end[ me ] = TRUE;
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phase[ me ] = ONE;
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while( lock_one );
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phase[ me ] = TWO;
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while( lock_two );
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phase[ me ] = THREE;
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lock_end[ me ] = FALSE;
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}
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void
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do_pass()
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{
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int i;
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pthread_t t[ N_THREADS ];
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int err;
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int done;
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/* Start N_THREADS threads, then join them so
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* that they are terminated.
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*/
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for( i = 0; i < N_THREADS; i++ ) {
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err = pthread_create( &t[i], NULL, spin, (void *)i );
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if( err != 0 ) {
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printf( "== Start/stop, error in thread %d create\n", i );
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}
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}
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/* Do phase 1.
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*/
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lock_one = FALSE;
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/* Do phase 2.
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*/
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lock_two = FALSE;
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/* Be done.
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*/
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done = 0;
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while( !done ) {
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/* Be optimistic.
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*/
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done = 1;
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for( i = 0; i < N_THREADS; i++ ) {
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if( lock_end[i] ) {
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/* Thread "i" is not ready yet.
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*/
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done = 0;
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break;
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}
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}
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}
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/* Finish up
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*/
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for( i = 0; i < N_THREADS; i++ ) {
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err = pthread_join(t[i], NULL ); /* Line 105 */
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if( err != 0 ) { /* Line 106 */
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printf( "== Start/stop, error in thread %d join\n", i );
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}
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}
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i = 10; /* Line 109. Null line for setting bpts on. */
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}
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main( argc, argv )
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int argc;
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char **argv;
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{
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int i;
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/* Init
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*/
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lock_one = TRUE;
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lock_two = TRUE;
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for( i = 0; i < N_THREADS; i++ ) {
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lock_end[i] = TRUE;
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phase[i] = ZERO;
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}
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do_pass();
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return(0);
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}
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