@@ -121,6 +121,7 @@
 import com.oracle.truffle.api.TruffleLanguage.Env;
 import com.oracle.truffle.api.TruffleLogger;
 import com.oracle.truffle.api.TruffleSafepoint;
+import com.oracle.truffle.api.dsl.Bind;
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.Cached.Shared;
 import com.oracle.truffle.api.dsl.NeverDefault;
@@ -130,6 +131,7 @@
 import com.oracle.truffle.api.interop.UnknownIdentifierException;
 import com.oracle.truffle.api.interop.UnsupportedMessageException;
 import com.oracle.truffle.api.interop.UnsupportedTypeException;
+import com.oracle.truffle.api.library.CachedLibrary;
 import com.oracle.truffle.api.library.ExportLibrary;
 import com.oracle.truffle.api.library.ExportMessage;
 import com.oracle.truffle.api.nodes.Node;
@@ -2276,16 +2278,34 @@ boolean semTryWait(long handle,
 
     @ExportMessage
     boolean semTimedWait(long handle, long deadlineNs,
-                    @Shared("invoke") @Cached InvokeNativeFunction invokeNode) throws PosixException {
-        int res = invokeNode.callInt(this, PosixNativeFunction.call_sem_timedwait, handle, deadlineNs);
-        if (res < 0) {
-            int errno = getErrno(invokeNode);
-            if (errno == OSErrorEnum.ETIMEDOUT.getNumber()) {
-                return false;
+                    @Bind("$node") Node node,
+                    @CachedLibrary("this") PosixSupportLibrary thisLib,
+                    @Shared("invoke") @Cached InvokeNativeFunction invokeNode) throws PosixException {
+        if (PythonOS.getPythonOS() == PythonOS.PLATFORM_LINUX) {
+            int res = invokeNode.callInt(this, PosixNativeFunction.call_sem_timedwait, handle, deadlineNs);
+            if (res < 0) {
+                int errno = getErrno(invokeNode);
+                if (errno == OSErrorEnum.ETIMEDOUT.getNumber()) {
+                    return false;
+                }
+                throw newPosixException(invokeNode, errno);
+            }
+            return true;
+        } else {
+            long deadlineMs = deadlineNs / 1_000_000;
+            while (true) {
+                if (thisLib.semTryWait(this, handle)) {
+                    return true;
+                }
+                long currentMs = System.currentTimeMillis();
+                if (currentMs > deadlineMs) {
+                    return false;
+                }
+                long delayMs = Math.min(deadlineMs - currentMs, 20);
+                TruffleSafepoint.setBlockedThreadInterruptible(node, Thread::sleep, delayMs);
+                TruffleSafepoint.poll(node);
             }
-            throw newPosixException(invokeNode, errno);
         }
-        return true;
     }
 
     @ExportMessage
 
@@ -938,11 +938,13 @@ int32_t call_sem_trywait(int64_t handle) {
     return sem_trywait((sem_t*)(uintptr_t)handle);
 }
 
+#ifdef __linux__
 int32_t call_sem_timedwait(int64_t handle, int64_t deadlineNs) {
     const int64_t nsInSec = 1000 * 1000 * 1000;
     struct timespec deadline = {deadlineNs / nsInSec, deadlineNs % nsInSec};
     return sem_timedwait((sem_t*)(uintptr_t)handle, &deadline);
 }
+#endif
 
 int32_t get_sysconf_getpw_r_size_max() {
     return sysconf(_SC_GETPW_R_SIZE_MAX);
Original file line number	Diff line number	Diff line change
`@@ -938,11 +938,13 @@ int32_t call_sem_trywait(int64_t handle) {`
`938`	`938`	`return sem_trywait((sem_t*)(uintptr_t)handle);`
`939`	`939`	`}`
`940`	`940`
	`941`	`+#ifdef __linux__`
`941`	`942`	`int32_t call_sem_timedwait(int64_t handle, int64_t deadlineNs) {`
`942`	`943`	`const int64_t nsInSec = 1000 * 1000 * 1000;`
`943`	`944`	`struct timespec deadline = {deadlineNs / nsInSec, deadlineNs % nsInSec};`
`944`	`945`	`return sem_timedwait((sem_t*)(uintptr_t)handle, &deadline);`
`945`	`946`	`}`
	`947`	`+#endif`
`946`	`948`
`947`	`949`	`int32_t get_sysconf_getpw_r_size_max() {`
`948`	`950`	`return sysconf(_SC_GETPW_R_SIZE_MAX);`