Attachment 1480405 Details for Bug 1624663 – reproduce code

reproduce code

sfdc02154588.c (text/x-csrc), 1.52 KB, created by Leo Song on 2018-09-03 01:44:23 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Leo Song

Created: 2018-09-03 01:44:23 UTC

Size: 1.52 KB

patch

obsolete

>#include <pthread.h>
>#include <stdlib.h>
>#include <sysexits.h>
>#include <unistd.h>
>
>/* gcc -std=c99 -O3 -Wall -Wextra -pedantic -lpthread sfdc02154588.c -o sfdc02154588 */
>/* ===vvv=== ADJUST BELOW ===vvv=== */
>#define THREADS                 8               
>#define MEM_TO_USE_MB           7168
>#define DELAY_TIME              100
>/* ===^^^=== ADJUST ABOVE ===^^^=== */
>
>#define __BYTES_PER_MEBIBYTE    1048576UL
>#define __MEM_TO_USE            (MEM_TO_USE_MB * __BYTES_PER_MEBIBYTE)
>#define MEM_PER_THREAD          (__MEM_TO_USE / THREADS)
>
>static void* thread(void* _data)
>{
>        (void)_data;
>        volatile char* ptr = NULL;
>
>        /* allocate some memory */
>        ptr = calloc(1, MEM_PER_THREAD);
>
>        /* and do some "useful" job */
>        for (;;)
>                for (volatile size_t i = 0; i < MEM_PER_THREAD; i++)
>                        ptr[i]++;
>
>        /* unreachable */
>        return NULL;
>}
>
>int main(int _argc, char** _argv)
>{
>        (void)_argc;
>        (void)_argv;
>
>        pthread_t ids[THREADS];
>
>        /* spawn threads */
>        for (size_t i = 0; i < THREADS; i++)
>        {
>          pthread_create (&ids[i], NULL, thread, NULL);
>          if(i==0)
>          {
>         /* To make the scenario, other threads are created after the delay time(default:100 sec) */
>            sleep(DELAY_TIME);
>          }
>        }
>        /* wait for threads to finish (it won't happen) */
>        for (size_t i = 0; i < THREADS; i++)
>                pthread_join(ids[i], NULL);
>
>        /* unreachable */
>        exit(EX_OK);
>}

Actions: View

Attachments on bug 1624663: 1480405