80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/* Thread local in a library.
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*/
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#include "thr-lib.h"
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/*
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* #define NTHREADS 4
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* #define NUM_ELEMS 12
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*/
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extern void* adder( void * );
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pthread_mutex_t mutex; /* mutex for protecting global data total */
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int numbers[NUM_ELEMS] = {5, 4, 3, 2, 1, 6, 7, 8, 9, 10, 12, 11};
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int total = 0;
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int debugger_saw[NTHREADS][ELEMS_PER_THREAD]; /* [4][3] */
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int the_code_saw[NTHREADS][ELEMS_PER_THREAD];
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int get_number(i)
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int i;
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{
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/* sleep to force context switch to another thread in non-MP system
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* so that TLS symbols are used by multiple threads concurrently
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* in some way.
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*/
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sleep(1);
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return numbers[i];
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}
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main()
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{
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pthread_t thread[NTHREADS];
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void *status;
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int i, j, ret;
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printf("== Thread: Test started\n");
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for( i = 0; i < NTHREADS; i++ ) {
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for( j = 0; j < ELEMS_PER_THREAD; j++ ) {
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debugger_saw[i][j] = 0;
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the_code_saw[i][j] = 0;
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}
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}
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ret = pthread_mutex_init(&mutex, NULL);
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if (ret != 0) {
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printf("== Thread: pthread_mutex_init() error: %d\n", ret);
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exit(1);
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}
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for (i=0; i < NTHREADS; i++) {
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ret = pthread_create( &thread[i],
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NULL,
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adder,
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(void *) i);
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if (ret != 0) {
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printf("== Thread: pthread_create() error: %d\n", ret);
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exit(1);
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}
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printf("== Thread: thread %d created\n", i);
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}
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for (i=0; i < NTHREADS; i++) {
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pthread_join( thread[i], &status);
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}
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printf("== Thread: total = %d\n", total); /* Expect "78" */
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for( i = 0; i < NTHREADS; i++ ) {
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for( j = 0; j < ELEMS_PER_THREAD; j++ ) {
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printf( "== Thread: the debugger saw %d, the program saw %d\n",
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debugger_saw[i][j],
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the_code_saw[i][j] );
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}
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}
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printf("== Thread: Test ended\n");
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exit(0);
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}
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