!pthread: implement cancellation points

common/cancellation.h

@@ -0,0 +1,42 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * Cancellation point handling
+ *
+ * Copyright 2026 Phoenix Systems
+ * Author: Adam Greloch
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef _LIBPHOENIX_WRAP_CANCEL_H_
+#define _LIBPHOENIX_WRAP_CANCEL_H_
+
+#include <pthread.h>
+
+#define CANCELLATION_POINT(rettype, function, args) ({ \
+	int __oldval = _pthread_enable_asynccancel(); \
+	rettype __ret = function args; \
+	_pthread_disable_asynccancel(__oldval); \
+	__ret; \
+})
+
+
+#define WRAP_ERRNO_DEF_CANCELLATION(rettype, function, arguments, argnames) \
+	extern rettype sys_##function arguments; \
+	rettype function arguments \
+	{ \
+		return SET_ERRNO(CANCELLATION_POINT(rettype, sys_##function, argnames)); \
+	}
+
+
+#define WRAP_CANCELLATION(rettype, function, arguments, argnames) \
+	extern rettype sys_##function arguments; \
+	rettype function arguments \
+	{ \
+		return CANCELLATION_POINT(rettype, sys_##function, argnames); \
+	}
+
+#endif

include/pthread.h

@@ -57,7 +57,11 @@ extern "C" {
 
 #define PTHREAD_CANCEL_DISABLE 0
 #define PTHREAD_CANCEL_ENABLE  1
-#define PTHREAD_CANCELED       2
+
+#define PTHREAD_CANCELED ((void *)-1)
+
+#define PTHREAD_CANCEL_DEFERRED     0
+#define PTHREAD_CANCEL_ASYNCHRONOUS 1
 
 /* clang-format off */
 #define PTHREAD_MUTEX_INITIALIZER  { 0, 0 }
@@ -78,6 +82,9 @@ int pthread_detach(pthread_t thread);
 int pthread_setcancelstate(int state, int *oldstate);
 
 
+int pthread_setcanceltype(int type, int *oldtype);
+
+
 int pthread_cancel(pthread_t thread);
 
 
@@ -293,6 +300,21 @@ void _pthread_atfork_parent(void);
 void _pthread_atfork_child(void);
 
 
+void _pthread_fork_child_reinit(pthread_t self);
+
+
+void _pthread_nocancel_begin(void);
+
+
+void _pthread_nocancel_end(void);
+
+
+int _pthread_enable_asynccancel(void);
+
+
+void _pthread_disable_asynccancel(int oldval);
+
+
 void pthread_cleanup_push(void (*routine)(void *), void *arg);