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misc: tst-poll: Proper synchronize with child before sending the signal

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When running the testsuite in parallel, for instance running make -j
$(nproc) check, occasionally tst-epoll fails with a timeout.  It happens
because it sometimes takes a bit more than 10ms for the process to get
cloned and blocked by the syscall.  In that case the signal is
sent to early, and the test fails with a timeout.

Checked on x86_64-linux-gnu.
This commit is contained in:
Adhemerval Zanella 2024-01-26 08:23:41 -03:00
parent 9c61303ebb
commit 26d01172f5
1 changed files with 3 additions and 3 deletions
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6
sysdeps/unix/sysv/linux/tst-epoll.c
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@ -22,7 +22,7 @@
#include <support/support.h>
#include <support/xsignal.h>
#include <support/xunistd.h>
#include <support/xtime.h>
#include <support/process_state.h>
#include <stdlib.h>
#include <sys/epoll.h>
@ -97,8 +97,8 @@ test_epoll_basic (epoll_wait_check_t epoll_wait_check)
xclose (fds[0][0]);
xclose (fds[1][1]);
/* Wait some time so child is blocked on the syscall. */
nanosleep (&(struct timespec) {0, 10000000}, NULL);
/* Wait until child is blocked on epoll_wait. */
support_process_state_wait (p, support_process_state_sleeping);
TEST_COMPARE (kill (p, SIGUSR1), 0);
int e = epoll_wait_check (efd, &event, 1, 500000000, &ss);