Added wait syscall.

This makes a process sleep until it receives a new message (no polling!).
I thought that this will result in performance improvements but I haven't
noticed any, yet. Maybe I'll remove this again in the future..

1 files changed, 2 insertions, 0 deletions

diff --git a/libc/inc/sys.h b/libc/inc/sys.h
index 073ccd2..1b01127 100644
--- a/libc/inc/sys.h
+++ b/libc/inc/sys.h
@@ -16,6 +16,7 @@ enum sys {
 	SYS_EXEC, // Execute path
 	SYS_EXIT, // Exit current process
 	SYS_YIELD, // Switch to next process
+	SYS_WAIT, // Sleep until new message arrives
 	SYS_TIME, // Get kernel time
 	SYS_REGISTER, // Register for event
 	SYS_UNREGISTER, // Unregister event
@@ -71,6 +72,7 @@ int sysv(enum sys num, ...);
 		}                                                                                  \
 	}
 #define yield() (int)sys0(SYS_YIELD)
+#define wait() (int)sys0(SYS_WAIT)
 #define time() (int)sys0(SYS_TIME)
 
 #define event_register(id) sys1(SYS_REGISTER, (int)(id))