@@ -7,3 +7,4 @@ futex_wait_timeout
futex_wait_uninitialized_heap
futex_wait_wouldblock
futex2_wait
+futex2_waitv
@@ -16,7 +16,8 @@ TEST_GEN_FILES := \
futex_requeue_pi_mismatched_ops \
futex_wait_uninitialized_heap \
futex_wait_private_mapped_file \
- futex2_wait
+ futex2_wait \
+ futex2_waitv
TEST_PROGS := run.sh
new file mode 100644
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/******************************************************************************
+ *
+ * Copyright Collabora Ltd., 2021
+ *
+ * DESCRIPTION
+ * Test waitv/wake mechanism of futex2, using 32bit sized futexes.
+ *
+ * AUTHOR
+ * André Almeida <andrealmeid@collabora.com>
+ *
+ * HISTORY
+ * 2021-Feb-5: Initial version by André <andrealmeid@collabora.com>
+ *
+ *****************************************************************************/
+
+#include <errno.h>
+#include <error.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <pthread.h>
+#include <sys/shm.h>
+#include "futex2test.h"
+#include "logging.h"
+
+#define TEST_NAME "futex2-wait"
+#define timeout_ns 1000000000
+#define WAKE_WAIT_US 10000
+#define NR_FUTEXES 30
+struct futex_waitv waitv[NR_FUTEXES];
+u_int32_t futexes[NR_FUTEXES] = {0};
+
+void usage(char *prog)
+{
+ printf("Usage: %s\n", prog);
+ printf(" -c Use color\n");
+ printf(" -h Display this help message\n");
+ printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
+ VQUIET, VCRITICAL, VINFO);
+}
+
+void *waiterfn(void *arg)
+{
+ struct timespec64 to64;
+ int res;
+
+ /* setting absolute timeout for futex2 */
+ if (gettime64(CLOCK_MONOTONIC, &to64))
+ error("gettime64 failed\n", errno);
+
+ to64.tv_sec++;
+
+ res = futex2_waitv(waitv, NR_FUTEXES, 0, &to64);
+ if (res < 0) {
+ ksft_test_result_fail("futex2_waitv private returned: %d %s\n",
+ res ? errno : res,
+ res ? strerror(errno) : "");
+ } else if (res != NR_FUTEXES - 1) {
+ ksft_test_result_fail("futex2_waitv private returned: %d %s\n",
+ res ? errno : res,
+ res ? strerror(errno) : "");
+ }
+
+ return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ pthread_t waiter;
+ int res, ret = RET_PASS;
+ int c, i;
+
+ while ((c = getopt(argc, argv, "cht:v:")) != -1) {
+ switch (c) {
+ case 'c':
+ log_color(1);
+ break;
+ case 'h':
+ usage(basename(argv[0]));
+ exit(0);
+ case 'v':
+ log_verbosity(atoi(optarg));
+ break;
+ default:
+ usage(basename(argv[0]));
+ exit(1);
+ }
+ }
+
+ ksft_print_header();
+ ksft_set_plan(2);
+ ksft_print_msg("%s: Test FUTEX2_WAITV\n",
+ basename(argv[0]));
+
+ for (i = 0; i < NR_FUTEXES; i++) {
+ waitv[i].uaddr = &futexes[i];
+ waitv[i].flags = FUTEX_32;
+ waitv[i].val = 0;
+ }
+
+ /* Private waitv */
+ if (pthread_create(&waiter, NULL, waiterfn, NULL))
+ error("pthread_create failed\n", errno);
+
+ usleep(WAKE_WAIT_US);
+
+ res = futex2_wake(waitv[NR_FUTEXES - 1].uaddr, 1, FUTEX_32);
+ if (res != 1) {
+ ksft_test_result_fail("futex2_waitv private returned: %d %s\n",
+ res ? errno : res,
+ res ? strerror(errno) : "");
+ ret = RET_FAIL;
+ } else {
+ ksft_test_result_pass("futex2_waitv private succeeds\n");
+ }
+
+ /* Shared waitv */
+ for (i = 0; i < NR_FUTEXES; i++) {
+ int shm_id = shmget(IPC_PRIVATE, 4096, IPC_CREAT | 0666);
+
+ if (shm_id < 0) {
+ perror("shmget");
+ exit(1);
+ }
+
+ unsigned int *shared_data = shmat(shm_id, NULL, 0);
+
+ *shared_data = 0;
+ waitv[i].uaddr = shared_data;
+ waitv[i].flags = FUTEX_32 | FUTEX_SHARED_FLAG;
+ waitv[i].val = 0;
+ }
+
+ if (pthread_create(&waiter, NULL, waiterfn, NULL))
+ error("pthread_create failed\n", errno);
+
+ usleep(WAKE_WAIT_US);
+
+ res = futex2_wake(waitv[NR_FUTEXES - 1].uaddr, 1, FUTEX_32 | FUTEX_SHARED_FLAG);
+ if (res != 1) {
+ ksft_test_result_fail("futex2_waitv shared returned: %d %s\n",
+ res ? errno : res,
+ res ? strerror(errno) : "");
+ ret = RET_FAIL;
+ } else {
+ ksft_test_result_pass("futex2_waitv shared succeeds\n");
+ }
+
+ for (i = 0; i < NR_FUTEXES; i++)
+ shmdt(waitv[i].uaddr);
+
+ ksft_print_cnts();
+ return ret;
+}
@@ -76,3 +76,6 @@ echo
echo
./futex2_wait $COLOR
+
+echo
+./futex2_waitv $COLOR
@@ -28,6 +28,19 @@
# define FUTEX_32 2
#endif
+#ifndef FUTEX_SHARED_FLAG
+#define FUTEX_SHARED_FLAG 8
+#endif
+
+#ifndef FUTEX_WAITV_MAX
+#define FUTEX_WAITV_MAX 128
+struct futex_waitv {
+ void *uaddr;
+ unsigned int val;
+ unsigned int flags;
+};
+#endif
+
/*
* - Y2038 section for 32-bit applications -
*
@@ -77,3 +90,16 @@ static inline int futex2_wake(volatile void *uaddr, unsigned int nr, unsigned lo
{
return syscall(__NR_futex_wake, uaddr, nr, flags);
}
+
+/**
+ * futex2_waitv - Wait at multiple futexes, wake on any
+ * @waiters: Array of waiters
+ * @nr_waiters: Length of waiters array
+ * @flags: Operation flags
+ * @timo: Optional timeout for operation
+ */
+static inline int futex2_waitv(volatile struct futex_waitv *waiters, unsigned long nr_waiters,
+ unsigned long flags, struct timespec64 *timo)
+{
+ return syscall(__NR_futex_waitv, waiters, nr_waiters, flags, timo);
+}
Create a new file to test the waitv mechanism. Test both private and shared futexes. Wake the last futex in the array, and check if the return value from futex_waitv() is the right index. Signed-off-by: André Almeida <andrealmeid@collabora.com> --- .../selftests/futex/functional/.gitignore | 1 + .../selftests/futex/functional/Makefile | 3 +- .../selftests/futex/functional/futex2_waitv.c | 157 ++++++++++++++++++ .../testing/selftests/futex/functional/run.sh | 3 + .../selftests/futex/include/futex2test.h | 26 +++ 5 files changed, 189 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/futex/functional/futex2_waitv.c