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--- base/allocator/partition_allocator/spinning_mutex.cc.orig 2022-02-07 13:39:41 UTC
+++ base/allocator/partition_allocator/spinning_mutex.cc
@@ -17,7 +17,15 @@
#if defined(PA_HAS_LINUX_KERNEL)
#include <errno.h>
+#if defined(OS_OPENBSD)
+#include <sys/futex.h>
+#elif defined(OS_FREEBSD)
+#include <sys/types.h>
+#include <sys/thr.h>
+#include <sys/umtx.h>
+#else
#include <linux/futex.h>
+#endif
#include <sys/syscall.h>
#include <unistd.h>
#endif // defined(PA_HAS_LINUX_KERNEL)
@@ -86,8 +94,13 @@ void SpinningMutex::FutexWait() {
// |kLockedContended| anymore. Note that even without spurious wakeups, the
// value of |state_| is not guaranteed when this returns, as another thread
// may get the lock before we get to run.
+#if defined(OS_FREEBSD)
+ int err = _umtx_op(&state_, UMTX_OP_WAIT_UINT_PRIVATE,
+ kLockedContended, nullptr, nullptr);
+#else
int err = syscall(SYS_futex, &state_, FUTEX_WAIT | FUTEX_PRIVATE_FLAG,
kLockedContended, nullptr, nullptr, 0);
+#endif
if (err) {
// These are programming error, check them.
@@ -99,8 +112,14 @@ void SpinningMutex::FutexWait() {
void SpinningMutex::FutexWake() {
int saved_errno = errno;
+#if defined(OS_FREEBSD)
+ long retval = _umtx_op(&state_, UMTX_OP_WAKE_PRIVATE,
+ 1 /* wake up a single waiter */, nullptr, nullptr);
+#else
long retval = syscall(SYS_futex, &state_, FUTEX_WAKE | FUTEX_PRIVATE_FLAG,
1 /* wake up a single waiter */, nullptr, nullptr, 0);
+#endif
+
PA_CHECK(retval != -1);
errno = saved_errno;
}
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