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authorWedson Almeida Filho <walmeida@microsoft.com>2023-03-26 06:57:38 +0300
committerMiguel Ojeda <ojeda@kernel.org>2023-04-22 02:46:45 +0300
commit19096bce815716cf93fc1ef3965629c3affa26f1 (patch)
treebb4d7969a0b433979d3f4a5b64ac2cc50d76078d /rust/helpers.c
parente32cca32c3d452a277884502b9155f3325caf80e (diff)
downloadlinux-19096bce815716cf93fc1ef3965629c3affa26f1.tar.xz
rust: sync: introduce `CondVar`
This is the traditional condition variable or monitor synchronisation primitive. It is implemented with C's `wait_queue_head_t`. It allows users to release a lock and go to sleep while guaranteeing that notifications won't be missed. This is achieved by enqueuing a wait entry before releasing the lock. Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Will Deacon <will@kernel.org> Cc: Waiman Long <longman@redhat.com> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://lore.kernel.org/r/20230411054543.21278-12-wedsonaf@gmail.com Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust/helpers.c')
-rw-r--r--rust/helpers.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/rust/helpers.c b/rust/helpers.c
index 2cb7b82053d8..81e80261d597 100644
--- a/rust/helpers.c
+++ b/rust/helpers.c
@@ -25,6 +25,7 @@
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/sched/signal.h>
+#include <linux/wait.h>
__noreturn void rust_helper_BUG(void)
{
@@ -61,6 +62,12 @@ void rust_helper_spin_unlock(spinlock_t *lock)
}
EXPORT_SYMBOL_GPL(rust_helper_spin_unlock);
+void rust_helper_init_wait(struct wait_queue_entry *wq_entry)
+{
+ init_wait(wq_entry);
+}
+EXPORT_SYMBOL_GPL(rust_helper_init_wait);
+
int rust_helper_signal_pending(struct task_struct *t)
{
return signal_pending(t);