From 5c6443ac42ba00ad3a0b4e98db4cc8f45596ca93 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 17 Nov 2012 18:42:16 -0500
Subject: [PATCH] add stub versions of some missing optional pthread interfaces

priority inheritance is not yet supported, and priority protection
probably will not be supported ever unless there's serious demand for
it (it's a fairly heavy-weight feature).

per-thread cpu clocks would be nice to have, but to my knowledge linux
is still not capable of supporting them. glibc fakes them by using the
_process_ cpu-time clock and subtracting the thread creation time,
which gives seriously incorrect semantics (worse than not supporting
the feature at all), so until there's a way to do it right, it will
remain as a stub that always fails.
---
 include/pthread.h                          | 5 +++++
 src/thread/pthread_attr_get.c              | 5 +++++
 src/thread/pthread_getcpuclockid.c         | 6 ++++++
 src/thread/pthread_mutex_getprioceiling.c  | 6 ++++++
 src/thread/pthread_mutex_setprioceiling.c  | 6 ++++++
 src/thread/pthread_mutexattr_setprotocol.c | 7 +++++++
 6 files changed, 35 insertions(+)
 create mode 100644 src/thread/pthread_getcpuclockid.c
 create mode 100644 src/thread/pthread_mutex_getprioceiling.c
 create mode 100644 src/thread/pthread_mutex_setprioceiling.c
 create mode 100644 src/thread/pthread_mutexattr_setprotocol.c

diff --git a/include/pthread.h b/include/pthread.h
index 660a64d9..6eee14cb 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -105,6 +105,9 @@ int pthread_mutex_timedlock(pthread_mutex_t *__restrict, const struct timespec *
 int pthread_mutex_destroy(pthread_mutex_t *);
 int pthread_mutex_consistent(pthread_mutex_t *);
 
+int pthread_mutex_getprioceiling(const pthread_mutex_t *__restrict, int *__restrict);
+int pthread_mutex_setprioceiling(pthread_mutex_t *__restrict, int, int *__restrict);
+
 int pthread_cond_init(pthread_cond_t *__restrict, const pthread_condattr_t *__restrict);
 int pthread_cond_destroy(pthread_cond_t *);
 int pthread_cond_wait(pthread_cond_t *__restrict, pthread_mutex_t *__restrict);
@@ -192,6 +195,8 @@ int pthread_atfork(void (*)(void), void (*)(void), void (*)(void));
 int pthread_getconcurrency(void);
 int pthread_setconcurrency(int);
 
+int pthread_getcpuclockid(pthread_t, clockid_t *);
+
 struct __ptcb {
 	void (*__f)(void *);
 	void *__x;
diff --git a/src/thread/pthread_attr_get.c b/src/thread/pthread_attr_get.c
index f81103d8..e4650e42 100644
--- a/src/thread/pthread_attr_get.c
+++ b/src/thread/pthread_attr_get.c
@@ -68,6 +68,11 @@ int pthread_condattr_getpshared(const pthread_condattr_t *restrict a, int *restr
 	return 0;
 }
 
+int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *restrict a, int *restrict protocol)
+{
+	*protocol = PTHREAD_PRIO_NONE;
+	return 0;
+}
 int pthread_mutexattr_getpshared(const pthread_mutexattr_t *restrict a, int *restrict pshared)
 {
 	*pshared = *a>>31;
diff --git a/src/thread/pthread_getcpuclockid.c b/src/thread/pthread_getcpuclockid.c
new file mode 100644
index 00000000..cf3d2b84
--- /dev/null
+++ b/src/thread/pthread_getcpuclockid.c
@@ -0,0 +1,6 @@
+#include "pthread_impl.h"
+
+int pthread_getcpuclockid(pthread_t t, clockid_t *clockid)
+{
+	return ENOSYS;
+}
diff --git a/src/thread/pthread_mutex_getprioceiling.c b/src/thread/pthread_mutex_getprioceiling.c
new file mode 100644
index 00000000..8c75a661
--- /dev/null
+++ b/src/thread/pthread_mutex_getprioceiling.c
@@ -0,0 +1,6 @@
+#include "pthread_impl.h"
+
+int pthread_mutex_getprioceiling(const pthread_mutex_t *restrict m, int *restrict ceiling)
+{
+	return EINVAL;
+}
diff --git a/src/thread/pthread_mutex_setprioceiling.c b/src/thread/pthread_mutex_setprioceiling.c
new file mode 100644
index 00000000..681f07c8
--- /dev/null
+++ b/src/thread/pthread_mutex_setprioceiling.c
@@ -0,0 +1,6 @@
+#include "pthread_impl.h"
+
+int pthread_mutex_setprioceiling(pthread_mutex_t *restrict m, int ceiling, int *restrict old)
+{
+	return EINVAL;
+}
diff --git a/src/thread/pthread_mutexattr_setprotocol.c b/src/thread/pthread_mutexattr_setprotocol.c
new file mode 100644
index 00000000..c92a31c8
--- /dev/null
+++ b/src/thread/pthread_mutexattr_setprotocol.c
@@ -0,0 +1,7 @@
+#include "pthread_impl.h"
+
+int pthread_mutexattr_setprotocol(pthread_mutexattr_t *a, int protocol)
+{
+	if (protocol) return ENOTSUP;
+	return 0;
+}
-- 
2.25.1