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lib/drmtest: extract igt_fork from gem_concurrent_blt

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Making sure that we correctly collect the exit codes from all children
is a bit a hassle. So add another magic igt codeblock for easy forking
and joining.

Note that children are (currently at least) not allowed to call igt_skip.
Add an assert to enforce this.

v2:
- Properly propagate the exit code.
- Fix the segfault.
- Add a child int and num_children paramter to the magic codeblock as
  suggested by Chris Wilson.
- Don't dump noise into stdout when a child thread fails, the parent
  will do that for us already.

v3: Now with some docs.

v4: Fixup igt_waitchildren to properly reset state so it can be used
again.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter
2013-08-29 10:06:51 +02:00
parent 90a25055e3
commit cd1f220847
3 changed files with 103 additions and 34 deletions
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tests/gem_concurrent_blit.c
+24 -34
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@@ -267,47 +267,37 @@ static void run_forked(struct access_mode *mode,
do_test do_test_func)
{
const int old_num_buffers = num_buffers;
pid_t children[16];
num_buffers /= ARRAY_SIZE(children);
num_buffers /= 16;
num_buffers += 2;
igt_fork_signal_helper();
for (int nc = 0; nc < ARRAY_SIZE(children); nc++) {
switch ((children[nc] = fork())) {
case -1: igt_assert(0);
default: break;
case 0:
/* recreate process local variables */
bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
drm_intel_bufmgr_gem_enable_reuse(bufmgr);
batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));
for (int i = 0; i < num_buffers; i++) {
src[i] = mode->create_bo(bufmgr, i, width, height);
dst[i] = mode->create_bo(bufmgr, ~i, width, height);
}
dummy = mode->create_bo(bufmgr, 0, width, height);
for (int loop = 0; loop < 10; loop++)
do_test_func(mode, src, dst, dummy);
/* as we borrow the fd, we need to reap our bo */
for (int i = 0; i < num_buffers; i++) {
drm_intel_bo_unreference(src[i]);
drm_intel_bo_unreference(dst[i]);
}
drm_intel_bo_unreference(dummy);
intel_batchbuffer_free(batch);
drm_intel_bufmgr_destroy(bufmgr);
exit(0);
igt_fork(child, 16) {
igt_fail(6);
/* recreate process local variables */
bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
drm_intel_bufmgr_gem_enable_reuse(bufmgr);
batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));
for (int i = 0; i < num_buffers; i++) {
src[i] = mode->create_bo(bufmgr, i, width, height);
dst[i] = mode->create_bo(bufmgr, ~i, width, height);
}
dummy = mode->create_bo(bufmgr, 0, width, height);
for (int loop = 0; loop < 10; loop++)
do_test_func(mode, src, dst, dummy);
/* as we borrow the fd, we need to reap our bo */
for (int i = 0; i < num_buffers; i++) {
drm_intel_bo_unreference(src[i]);
drm_intel_bo_unreference(dst[i]);
}
drm_intel_bo_unreference(dummy);
intel_batchbuffer_free(batch);
drm_intel_bufmgr_destroy(bufmgr);
}
for (int nc = 0; nc < ARRAY_SIZE(children); nc++) {
int status = -1;
while (waitpid(children[nc], &status, 0) == -1 &&
errno == -EINTR)
;
igt_assert(status == 0);
}
igt_waitchildren();
igt_stop_signal_helper();