init/lib: implement "evil semaphores"

I started implementing native semaphores in the kernel, but then I've
realized that I can implement them in userland using pipes.

Thus, this hot garbage was born.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/init/lib/esemaphore.h b/src/init/lib/esemaphore.h
new file mode 100644
index 0000000..e746bd7
--- /dev/null
+++ b/src/init/lib/esemaphore.h
@@ -0,0 +1,12 @@
+#pragma once
+#include <shared/types.h>
+
+struct evil_sem {
+	handle_t wait, signal;
+};
+
+void esem_signal(struct evil_sem *sem);
+void esem_wait(struct evil_sem *sem);
+
+struct evil_sem *esem_new(int value);
+void esem_free(struct evil_sem *sem);