Move c_src dirs back to toplevel

[bcachefs-tools-debian] / c_src / linux / preempt.c

diff --git a/c_src/linux/preempt.c b/c_src/linux/preempt.c
deleted file mode 100644 (file)
index 72eceed..0000000
--- a/c_src/linux/preempt.c
+++ /dev/null
@@ -1,37 +0,0 @@
-#include <pthread.h>
-
-#include "linux/preempt.h"
-
-/*
- * In userspace, pthreads are preemptible and can migrate CPUs at any time.
- *
- * In the kernel, preempt_disable() logic essentially guarantees that a marked
- * critical section owns its CPU for the relevant block. This is necessary for
- * various code paths, critically including the percpu system as it allows for
- * non-atomic reads and writes to CPU-local data structures.
- *
- * The high performance userspace equivalent would be to use thread local
- * storage to replace percpu data, but that would be complicated. It should be
- * correct to instead guarantee mutual exclusion for the critical sections.
- */
-
-static pthread_mutex_t preempt_lock;
-
-__attribute__((constructor))
-static void preempt_init(void) {
-       pthread_mutexattr_t attr;
-       pthread_mutexattr_init(&attr);
-       pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
-       pthread_mutex_init(&preempt_lock, &attr);
-       pthread_mutexattr_destroy(&attr);
-}
-
-void preempt_disable(void)
-{
-       pthread_mutex_lock(&preempt_lock);
-}
-
-void preempt_enable(void)
-{
-       pthread_mutex_unlock(&preempt_lock);
-}