Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Implement waitable_atomic for FreeBSD #1607

Open
wants to merge 3 commits into
base: master
Choose a base branch
from
Open

Implement waitable_atomic for FreeBSD #1607

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
b7ae3b9
Implement waitable_atomic for FreeBSD
ronaldklop Jan 9, 2025
5daa46f
Reimplement waitable_atomic.cpp to use absolute times.
ronaldklop Feb 4, 2025
50f7e84
Merge branch 'mongodb:master' into master
ronaldklop Feb 4, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
42 changes: 42 additions & 0 deletions src/mongo/platform/waitable_atomic.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,9 @@
#ifdef __linux__
#include <linux/futex.h>
#include <sys/syscall.h>
#elif defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/umtx.h>
#elif defined(_WIN32)
#include <synchapi.h>
#endif
Expand Down Expand Up @@ -235,6 +238,45 @@ bool waitUntil(const void* uaddr,
return timeoutOverflow || errno != ETIMEDOUT;
}

#elif defined(__FreeBSD__)

void notifyOne(const void* uaddr) {
_umtx_op(const_cast<void*>(uaddr), UMTX_OP_WAKE_PRIVATE, 1, NULL, NULL);
}

void notifyMany(const void* uaddr, int nToWake) {
_umtx_op(const_cast<void*>(uaddr), UMTX_OP_WAKE_PRIVATE, nToWake, NULL, NULL);
}

void notifyAll(const void* uaddr) {
_umtx_op(const_cast<void*>(uaddr), UMTX_OP_WAKE_PRIVATE, INT_MAX, NULL, NULL);
}

bool waitUntil(const void* uaddr,
uint32_t old,
boost::optional<system_clock::time_point> deadline) {
struct _umtx_time umtx_deadline;
void* uaddr2 = nullptr;

if (deadline) {
umtx_deadline._timeout.tv_sec = durationCount<Seconds>(deadline->time_since_epoch());
umtx_deadline._timeout.tv_nsec = durationCount<Nanoseconds>(
deadline->time_since_epoch() - stdx::chrono::seconds(umtx_deadline._timeout.tv_sec));
umtx_deadline._flags = UMTX_ABSTIME;
umtx_deadline._clockid = CLOCK_REALTIME_FAST;
uaddr2 = &umtx_deadline;
}

int umtxOpRet;
if ((umtxOpRet = _umtx_op(const_cast<void*>(uaddr), UMTX_OP_WAIT_UINT_PRIVATE, old, (void*)sizeof(struct _umtx_time), uaddr2)) != 0) {
if (errno == ETIMEDOUT) {
return false;
}
invariant(umtxOpRet == 0, errorMessage(lastSystemError()));
}
return true;
}

#else
#error "Need an implementation of waitUntil(), notifyOne(), notifyMany(), notifyAll() for this OS"
#endif
Expand Down