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authorRich Felker <dalias@aerifal.cx>2012-08-25 22:49:47 -0400
committerRich Felker <dalias@aerifal.cx>2012-08-25 22:49:47 -0400
commitb5289fd749bc4d2637610d712f8fe650f214f1d5 (patch)
tree01384c6a2f5c14b3c909dc98c9552c25e86f6196
parenta5d6199d091aad750b1fc325240a141a88ee770e (diff)
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add c11 quick_exit and at_quick_exit functions
-rw-r--r--include/stdlib.h2
-rw-r--r--src/exit/at_quick_exit.c29
-rw-r--r--src/exit/quick_exit.c15
3 files changed, 46 insertions, 0 deletions
diff --git a/include/stdlib.h b/include/stdlib.h
index 0a8de866..c1d93e71 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -43,6 +43,8 @@ void abort (void);
int atexit (void (*) (void));
void exit (int);
void _Exit (int);
+int at_quick_exit (void (*) (void));
+void quick_exit (int);
char *getenv (const char *);
diff --git a/src/exit/at_quick_exit.c b/src/exit/at_quick_exit.c
new file mode 100644
index 00000000..85c3d26e
--- /dev/null
+++ b/src/exit/at_quick_exit.c
@@ -0,0 +1,29 @@
+#include <stdlib.h>
+#include "libc.h"
+
+#define COUNT 32
+
+static void (*funcs[COUNT])(void);
+static int count;
+static int lock[2];
+
+void __funcs_on_quick_exit()
+{
+ void (*func)(void);
+ LOCK(lock);
+ while (count > 0) {
+ func = funcs[--count];
+ UNLOCK(lock);
+ func();
+ LOCK(lock);
+ }
+}
+
+int at_quick_exit(void (*func)(void))
+{
+ if (count == 32) return -1;
+ LOCK(lock);
+ funcs[count++] = func;
+ UNLOCK(lock);
+ return 0;
+}
diff --git a/src/exit/quick_exit.c b/src/exit/quick_exit.c
new file mode 100644
index 00000000..18d5288a
--- /dev/null
+++ b/src/exit/quick_exit.c
@@ -0,0 +1,15 @@
+#include <stdlib.h>
+#include "syscall.h"
+#include "atomic.h"
+#include "libc.h"
+
+static void dummy() { }
+weak_alias(dummy, __funcs_on_quick_exit);
+
+void quick_exit(int code)
+{
+ static int lock;
+ while (a_swap(&lock, 1)) __syscall(SYS_pause);
+ __funcs_on_quick_exit();
+ _Exit(code);
+}