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author | Alex Bennée <alex.bennee@linaro.org> | 2021-05-27 17:03:14 +0100 |
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committer | Alex Bennée <alex.bennee@linaro.org> | 2021-06-07 14:42:42 +0100 |
commit | 81c4edc39e550efd639f7730dd94029e04cf7b96 (patch) | |
tree | 6345be3a5a4d72585ba5a0a242b1130b8aacab51 /tests/tcg/multiarch | |
parent | 6f398e533f5e259b4f937f4aa9de970f7201d166 (diff) | |
download | qemu-81c4edc39e550efd639f7730dd94029e04cf7b96.zip qemu-81c4edc39e550efd639f7730dd94029e04cf7b96.tar.gz qemu-81c4edc39e550efd639f7730dd94029e04cf7b96.tar.bz2 |
tests/tcg: add a multiarch signals test to stress test signal delivery
This adds a simple signal test that combines the POSIX timer_create
with signal delivery across multiple threads. The aim is to provide a
bit more of a stress test to flush out signal handling issues for
easily than the occasional random crash we sometimes see in linux-test
or threadcount.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210527160319.19834-2-alex.bennee@linaro.org>
Diffstat (limited to 'tests/tcg/multiarch')
-rw-r--r-- | tests/tcg/multiarch/Makefile.target | 2 | ||||
-rw-r--r-- | tests/tcg/multiarch/signals.c | 149 |
2 files changed, 151 insertions, 0 deletions
diff --git a/tests/tcg/multiarch/Makefile.target b/tests/tcg/multiarch/Makefile.target index a3a7517..3f283ea 100644 --- a/tests/tcg/multiarch/Makefile.target +++ b/tests/tcg/multiarch/Makefile.target @@ -30,6 +30,8 @@ testthread: LDFLAGS+=-lpthread threadcount: LDFLAGS+=-lpthread +signals: LDFLAGS+=-lrt -lpthread + # We define the runner for test-mmap after the individual # architectures have defined their supported pages sizes. If no # additional page sizes are defined we only run the default test. diff --git a/tests/tcg/multiarch/signals.c b/tests/tcg/multiarch/signals.c new file mode 100644 index 0000000..998c8fd --- /dev/null +++ b/tests/tcg/multiarch/signals.c @@ -0,0 +1,149 @@ +/* + * linux-user signal handling tests. + * + * Copyright (c) 2021 Linaro Ltd + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include <stdarg.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <pthread.h> +#include <string.h> +#include <signal.h> +#include <time.h> +#include <sys/time.h> + +static void error1(const char *filename, int line, const char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + fprintf(stderr, "%s:%d: ", filename, line); + vfprintf(stderr, fmt, ap); + fprintf(stderr, "\n"); + va_end(ap); + exit(1); +} + +static int __chk_error(const char *filename, int line, int ret) +{ + if (ret < 0) { + error1(filename, line, "%m (ret=%d, errno=%d/%s)", + ret, errno, strerror(errno)); + } + return ret; +} + +#define error(fmt, ...) error1(__FILE__, __LINE__, fmt, ## __VA_ARGS__) + +#define chk_error(ret) __chk_error(__FILE__, __LINE__, (ret)) + +/* + * Thread handling + */ +typedef struct ThreadJob ThreadJob; + +struct ThreadJob { + int number; + int sleep; + int count; +}; + +static pthread_t *threads; +static int max_threads = 10; +__thread int signal_count; +int total_signal_count; + +static void *background_thread_func(void *arg) +{ + ThreadJob *job = (ThreadJob *) arg; + + printf("thread%d: started\n", job->number); + while (total_signal_count < job->count) { + usleep(job->sleep); + } + printf("thread%d: saw %d alarms from %d\n", job->number, + signal_count, total_signal_count); + return NULL; +} + +static void spawn_threads(void) +{ + int i; + threads = calloc(sizeof(pthread_t), max_threads); + + for (i = 0; i < max_threads; i++) { + ThreadJob *job = calloc(sizeof(ThreadJob), 1); + job->number = i; + job->sleep = i * 1000; + job->count = i * 100; + pthread_create(threads + i, NULL, background_thread_func, job); + } +} + +static void close_threads(void) +{ + int i; + for (i = 0; i < max_threads; i++) { + pthread_join(threads[i], NULL); + } + free(threads); + threads = NULL; +} + +static void sig_alarm(int sig, siginfo_t *info, void *puc) +{ + if (sig != SIGRTMIN) { + error("unexpected signal"); + } + signal_count++; + __atomic_fetch_add(&total_signal_count, 1, __ATOMIC_SEQ_CST); +} + +static void test_signals(void) +{ + struct sigaction act; + struct itimerspec it; + timer_t tid; + struct sigevent sev; + + /* Set up SIG handler */ + act.sa_sigaction = sig_alarm; + sigemptyset(&act.sa_mask); + act.sa_flags = SA_SIGINFO; + chk_error(sigaction(SIGRTMIN, &act, NULL)); + + /* Create POSIX timer */ + sev.sigev_notify = SIGEV_SIGNAL; + sev.sigev_signo = SIGRTMIN; + sev.sigev_value.sival_ptr = &tid; + chk_error(timer_create(CLOCK_REALTIME, &sev, &tid)); + + it.it_interval.tv_sec = 0; + it.it_interval.tv_nsec = 1000000; + it.it_value.tv_sec = 0; + it.it_value.tv_nsec = 1000000; + chk_error(timer_settime(tid, 0, &it, NULL)); + + spawn_threads(); + + do { + usleep(1000); + } while (total_signal_count < 2000); + + printf("shutting down after: %d signals\n", total_signal_count); + + close_threads(); + + chk_error(timer_delete(tid)); +} + +int main(int argc, char **argv) +{ + test_signals(); + return 0; +} |