mirror of
https://github.com/jart/cosmopolitan.git
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d50d954a3c
Using callbacks is still problematic with cosmo_dlopen() due to the need to restore the TLS register. So using callbacks is even more strict than using signal handlers. We are better off introducing a cosmoaudio_poll() function. It makes the API more UNIX-like. How bad could the latency be?
56 lines
2.7 KiB
C
56 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2024 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/timespec.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/thread/thread.h"
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#define ALLOCATIONS 1000
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void *worker(void *arg) {
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void **ptrs = malloc(ALLOCATIONS * sizeof(void *));
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for (int i = 0; i < ALLOCATIONS; ++i)
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ptrs[i] = malloc(1);
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for (int i = 0; i < ALLOCATIONS; ++i)
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free(ptrs[i]);
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free(ptrs);
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return 0;
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}
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void test(int n) {
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struct timespec start = timespec_mono();
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pthread_t *th = malloc(sizeof(pthread_t) * n);
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for (int i = 0; i < n; ++i)
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pthread_create(th + i, 0, worker, 0);
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for (int i = 0; i < n; ++i)
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pthread_join(th[i], 0);
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free(th);
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struct timespec end = timespec_mono();
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printf("%2d threads * %d allocs = %ld us\n", n, ALLOCATIONS,
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timespec_tomicros(timespec_sub(end, start)));
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}
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int main(int argc, char *argv[]) {
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int n = __get_cpu_count();
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if (n < 8)
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n = 8;
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for (int i = 1; i <= n; ++i)
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test(i);
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}
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