[SystemZ][z/OS] z/OS does not support nanosleep, use usleep instead

[abhina-sree]

Use usleep instead of nanosleep to resolve a build error on z/OS because there is no support for nanosleep.

[llvmbot]

@llvm/pr-subscribers-llvm-support

Author: Abhina Sree (abhina-sree)

Changes

Use usleep instead of nanosleep to resolve a build error on z/OS because there is no support for nanosleep.

---

Full diff: https://github.com/llvm/llvm-project/pull/109823.diff

1 Files Affected:

• (modified) llvm/unittests/Support/TimerTest.cpp (+4)

diff --git a/llvm/unittests/Support/TimerTest.cpp b/llvm/unittests/Support/TimerTest.cpp
index 09545eb6939aeb..30f9f132a8d15a 100644
--- a/llvm/unittests/Support/TimerTest.cpp
+++ b/llvm/unittests/Support/TimerTest.cpp
@@ -27,6 +27,10 @@ void SleepMS() {
   struct timespec Interval;
   Interval.tv_sec = 0;
   Interval.tv_nsec = 1000000;
+#if defined(__MVS__)
+  long Microseconds = (Interval.tv_nsec + 999) / 1000;
+  usleep(Microseconds);
+#else
   nanosleep(&Interval, nullptr);
 #endif
 }

[zibi2]

We do have nanosleep() under std::__ibm.

Note that this change is temporary only until we move up the LE level having this function.

[zibi2]

We do have nanosleep() under std::__ibm.

However, this is internal change which eventually will go away.

[zibi2]

LGTM