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misc: tst-poll: Proper synchronize with child before sending the signal
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.
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@ -22,7 +22,7 @@
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#include <support/support.h>
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#include <support/xsignal.h>
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#include <support/xunistd.h>
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#include <support/xtime.h>
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#include <support/process_state.h>
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#include <stdlib.h>
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#include <sys/epoll.h>
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@ -97,8 +97,8 @@ test_epoll_basic (epoll_wait_check_t epoll_wait_check)
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xclose (fds[0][0]);
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xclose (fds[1][1]);
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/* Wait some time so child is blocked on the syscall. */
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nanosleep (&(struct timespec) {0, 10000000}, NULL);
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/* Wait until child is blocked on epoll_wait. */
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support_process_state_wait (p, support_process_state_sleeping);
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TEST_COMPARE (kill (p, SIGUSR1), 0);
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int e = epoll_wait_check (efd, &event, 1, 500000000, &ss);
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