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rust: sync: introduce CondVar

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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>
This commit is contained in:
Wedson Almeida Filho
2023-03-26 00:57:38 -03:00
committed by Miguel Ojeda
parent e32cca32c3
commit 19096bce81
5 changed files with 184 additions and 1 deletions
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7
rust/helpers.c
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@@ -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);