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1962ab6f6e
The count variable is incremented by multiple threads, doing so without an atomic operation causes thread sanitizer warnings. Switch to using relaxed atomics. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20230114215251.271678-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
53 lines
895 B
C
53 lines
895 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <pthread.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <linux/compiler.h>
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#include "../tests.h"
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static volatile sig_atomic_t done;
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static volatile unsigned count;
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/* We want to check this symbol in perf report */
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noinline void test_loop(void);
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static void sighandler(int sig __maybe_unused)
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{
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done = 1;
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}
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noinline void test_loop(void)
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{
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while (!done)
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__atomic_fetch_add(&count, 1, __ATOMIC_RELAXED);
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}
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static void *thfunc(void *arg)
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{
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void (*loop_fn)(void) = arg;
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loop_fn();
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return NULL;
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}
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static int thloop(int argc, const char **argv)
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{
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int sec = 1;
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pthread_t th;
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if (argc > 0)
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sec = atoi(argv[0]);
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signal(SIGINT, sighandler);
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signal(SIGALRM, sighandler);
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alarm(sec);
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pthread_create(&th, NULL, thfunc, test_loop);
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test_loop();
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pthread_join(th, NULL);
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return 0;
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}
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DEFINE_WORKLOAD(thloop);
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