implement POSIX timers

this implementation is superior to the glibc/nptl implementation, in
that it gives true realtime behavior. there is no risk of timer
expiration events being lost due to failed thread creation or failed
malloc, because the thread is created as time creation time, and
reused until the timer is deleted.

2 files changed, 17 insertions, 6 deletions

diff --git a/include/limits.h b/include/limits.h
index 55ad8231..3953aea5 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -31,6 +31,7 @@
 #define PTHREAD_DESTRUCTOR_ITERATIONS 4
 #define SEM_VALUE_MAX 0x7fffffff
 #define SEM_NSEMS_MAX 256
+#define DELAYTIMER_MAX 0x7fffffff
 
 /* Arbitrary numbers... */
 
diff --git a/include/signal.h b/include/signal.h
index f5e87c78..6116fb43 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -17,6 +17,7 @@ extern "C" {
 #define __NEED_uid_t
 #define __NEED_struct_timespec
 #define __NEED_pthread_t
+#define __NEED_pthread_attr_t
 #define __NEED_time_t
 #define __NEED_clock_t
 #define __NEED_sigset_t
@@ -24,8 +25,7 @@ extern "C" {
 
 #include <bits/alltypes.h>
 
-struct sigaction
-{
+struct sigaction {
 	union {
 		void (*sa_handler)(int);
 		void (*sa_sigaction)(int, siginfo_t *, void *);
@@ -37,19 +37,29 @@ struct sigaction
 #define sa_handler   __sa_handler.sa_handler
 #define sa_sigaction __sa_handler.sa_sigaction
 
-typedef struct
-{
+typedef struct {
 	void *ss_sp;
 	int ss_flags;
 	size_t ss_size;
 } stack_t;
 
-union sigval
-{
+union sigval {
 	int sival_int;
 	void *sival_ptr;
 };
 
+struct sigevent {
+	union sigval sigev_value;
+	int sigev_signo;
+	int sigev_notify;
+	void (*sigev_notify_function)(union sigval);
+	pthread_attr_t *sigev_notify_attributes;
+};
+
+#define SIGEV_SIGNAL 0
+#define SIGEV_NONE 1
+#define SIGEV_THREAD 2
+
 int __libc_current_sigrtmin(void);
 int __libc_current_sigrtmax(void);