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146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
/* multi-threaded memory allocation/deallocation test.
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Copyright (C) 2024-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/xthread.h>
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#include <support/test-driver.h>
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#include <sys/sysinfo.h>
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#include <unistd.h>
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#ifndef ITERATIONS
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# define ITERATIONS 16
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#endif
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#ifndef NUM_THREADS
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# define NUM_THREADS 8
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#endif
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#ifndef NUM_ALLOCATIONS
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# define NUM_ALLOCATIONS 2048
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#endif
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static pthread_barrier_t barrier;
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__thread unsigned int seed;
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typedef struct
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{
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int id;
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pthread_t thread;
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} thread;
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thread threads[NUM_THREADS];
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void *allocations[NUM_THREADS][NUM_ALLOCATIONS];
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void
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run_thread_dealloc (int id)
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{
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for (int i = 0; i < NUM_ALLOCATIONS; i++)
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{
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free (allocations[id][i]);
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allocations[id][i] = NULL;
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}
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}
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void
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run_thread_alloc (int id)
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{
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size_t msb, size;
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for (int i = 0; i < NUM_ALLOCATIONS; i++)
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{
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msb = 1 << rand_r (&seed) % 16;
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size = msb + rand_r (&seed) % msb;
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allocations[id][i] = malloc (size);
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TEST_VERIFY_EXIT (allocations[id][i] != NULL);
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}
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}
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void *
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run_allocations (void *arg)
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{
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int id = *((int *) arg);
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seed = time (NULL) + id;
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/* Stage 1: First half o the threads allocating memory and the second
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* half waiting for them to finish
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*/
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if (id < NUM_THREADS / 2)
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run_thread_alloc (id);
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xpthread_barrier_wait (&barrier);
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/* Stage 2: Half of the threads allocationg memory and the other
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* half deallocating:
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* - In the non cross-thread dealloc scenario the first half will be
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* deallocating the memory allocated by themselves in stage 1 and the
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* second half will be allocating memory.
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* - In the cross-thread dealloc scenario the first half will continue
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* to allocate memory and the second half will deallocate the memory
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* allocated by the first half in stage 1.
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*/
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if (id < NUM_THREADS / 2)
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#ifndef CROSS_THREAD_DEALLOC
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run_thread_dealloc (id);
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#else
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run_thread_alloc (id + NUM_THREADS / 2);
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#endif
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else
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#ifndef CROSS_THREAD_DEALLOC
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run_thread_alloc (id);
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#else
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run_thread_dealloc (id - NUM_THREADS / 2);
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#endif
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xpthread_barrier_wait (&barrier);
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// Stage 3: Second half of the threads deallocating and the first half
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// waiting for them to finish.
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if (id >= NUM_THREADS / 2)
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run_thread_dealloc (id);
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return NULL;
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}
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static int
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do_test (void)
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{
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xpthread_barrier_init (&barrier, NULL, NUM_THREADS);
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for (int i = 0; i < ITERATIONS; i++)
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{
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for (int t = 0; t < NUM_THREADS; t++)
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{
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threads[t].id = t;
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threads[t].thread
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= xpthread_create (NULL, run_allocations, &threads[t].id);
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}
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for (int t = 0; t < NUM_THREADS; t++)
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xpthread_join (threads[t].thread);
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}
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return 0;
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}
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#include <support/test-driver.c>
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