new file mode 100644
@@ -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;
+}
@@ -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.
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. [AJB: this is still triggering intermittent failures in some guests so will probably be kept out of PRs until that is fixed.] Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20210504100223.25427-29-alex.bennee@linaro.org> --- tests/tcg/multiarch/signals.c | 149 ++++++++++++++++++++++++++++ tests/tcg/multiarch/Makefile.target | 2 + 2 files changed, 151 insertions(+) create mode 100644 tests/tcg/multiarch/signals.c -- 2.20.1