diff --git a/arch/arm/bits/pthread.h b/arch/arm/bits/pthread.h
deleted file mode 100644
index 9cd15f2574a1d1a9a0f1599519a048bb95e03c27..0000000000000000000000000000000000000000
--- a/arch/arm/bits/pthread.h
+++ /dev/null
@@ -1,6 +0,0 @@
-struct __ptcb {
-	long __jb[64];
-	int __dummy;
-	struct __ptcb *__next;
-	void *__ptrs[3];
-};
diff --git a/arch/i386/bits/pthread.h b/arch/i386/bits/pthread.h
deleted file mode 100644
index c119dc8a9a4da8876bfa2b15fa7d8f11acbe8d33..0000000000000000000000000000000000000000
--- a/arch/i386/bits/pthread.h
+++ /dev/null
@@ -1,25 +0,0 @@
-struct __ptcb {
-	long __jb[7];
-	int __dummy;
-	struct __ptcb *__next;
-	void *__ptrs[3];
-};
-
-static inline void __pthread_register_cancel_2(struct __ptcb *__cb)
-{
-	__asm__ __volatile__( "call __pthread_register_cancel" : : "a"(__cb) : "ecx", "edx", "memory" );
-}
-
-static inline void __pthread_unregister_cancel_2(struct __ptcb *__cb)
-{
-	__asm__ __volatile__( "call __pthread_unregister_cancel" : : "a"(__cb) : "ecx", "edx", "memory" );
-}
-
-static inline void __pthread_unwind_next_2(struct __ptcb *__cb)
-{
-	__asm__ __volatile__( "call __pthread_unwind_next" : : "a"(__cb) : "ecx", "edx", "memory" );
-}
-
-#define __pthread_register_cancel __pthread_register_cancel_2
-#define __pthread_unregister_cancel __pthread_unregister_cancel_2
-#define __pthread_unwind_next __pthread_unwind_next_2
diff --git a/arch/x86_64/bits/pthread.h b/arch/x86_64/bits/pthread.h
deleted file mode 100644
index 7d19065dedc1f4b144e6bbf807e96fad83e0f062..0000000000000000000000000000000000000000
--- a/arch/x86_64/bits/pthread.h
+++ /dev/null
@@ -1,6 +0,0 @@
-struct __ptcb {
-	long __jb[7];
-	int __dummy;
-	struct __ptcb *__next;
-	void *__ptrs[3];
-};
diff --git a/include/pthread.h b/include/pthread.h
index 44a710197210a5cc1abd4edf6e52c74b8be2a701..1b7f9fd37a8bf69646ece3bdc61cf1678236adf2 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -186,24 +186,17 @@ int pthread_atfork(void (*)(void), void (*)(void), void (*)(void));
 int pthread_getconcurrency(void);
 int pthread_setconcurrency(int);
 
-#include <bits/pthread.h>
+struct __ptcb {
+	void (*__f)(void *);
+	void *__x;
+	struct __ptcb *__next;
+};
 
-int __setjmp(void *);
-#ifndef __pthread_register_cancel
-void __pthread_register_cancel(struct __ptcb *);
-void __pthread_unregister_cancel(struct __ptcb *);
-void __pthread_unwind_next(struct __ptcb *);
-#endif
-
-#define pthread_cleanup_push(f, x) \
-do { struct __ptcb __cb; void (*__f)(void *) = (f); void *__x = (x); \
-if (__setjmp(__cb.__jb)) __f(__x), __pthread_unwind_next(&__cb); \
-__pthread_register_cancel(&__cb); {
-
-#define pthread_cleanup_pop(r) ; } \
-__pthread_unregister_cancel(&__cb); \
-if (r) __f(__x); } while (0)
+void _pthread_cleanup_push(struct __ptcb *, void (*)(void *), void *);
+void _pthread_cleanup_pop(struct __ptcb *, int);
 
+#define pthread_cleanup_push(f, x) do { struct __ptcb __cb; _pthread_cleanup_push(&__cb, f, x);
+#define pthread_cleanup_pop(r) _pthread_cleanup_pop(&__cb, (r)); } while(0)
 
 #ifdef __cplusplus
 }
diff --git a/src/thread/cancellation.c b/src/thread/cancellation.c
index b02cdfb093cc528413cc79f1384f19418335b0d6..967705a910a4213b48be5f3ab79e2816cb501c93 100644
--- a/src/thread/cancellation.c
+++ b/src/thread/cancellation.c
@@ -1,23 +1,20 @@
 #include "pthread_impl.h"
 
-static void dummy(struct __ptcb *cb)
-{
-}
-weak_alias(dummy, __pthread_do_unwind);
-weak_alias(dummy, __pthread_do_register);
-weak_alias(dummy, __pthread_do_unregister);
+void __do_cleanup_push();
+void __do_cleanup_pop();
 
-void __pthread_unwind_next(struct __ptcb *cb)
+void _pthread_cleanup_push(struct __ptcb *cb, void (*f)(void *), void *x)
 {
-	__pthread_do_unwind(cb);
+	__do_cleanup_push(cb, f, x);
 }
 
-void __pthread_register_cancel(struct __ptcb *cb)
+void _pthread_cleanup_pop(struct __ptcb *cb, int run)
 {
-	__pthread_do_register(cb);
+	__do_cleanup_pop(cb, run);
 }
 
-void __pthread_unregister_cancel(struct __ptcb *cb)
+static void dummy()
 {
-	__pthread_do_unregister(cb);
 }
+weak_alias(dummy, __do_cleanup_push);
+weak_alias(dummy, __do_cleanup_pop);
diff --git a/src/thread/i386/cancellation.s b/src/thread/i386/cancellation.s
deleted file mode 100644
index 75dc60913eadc98f03454a3ba2ed57539f3285f2..0000000000000000000000000000000000000000
--- a/src/thread/i386/cancellation.s
+++ /dev/null
@@ -1,34 +0,0 @@
-.text
-.global __pthread_register_cancel
-.type   __pthread_register_cancel,@function
-__pthread_register_cancel:
-	pushl %eax
-	call __pthread_do_register
-	popl %eax
-	ret
-
-.global __pthread_unregister_cancel
-.type   __pthread_unregister_cancel,@function
-__pthread_unregister_cancel:
-	pushl %eax
-	call __pthread_do_unregister
-	popl %eax
-	ret
-
-.global __pthread_unwind_next
-.type   __pthread_unwind_next,@function
-__pthread_unwind_next:
-	pushl %eax
-	call __pthread_do_unwind
-	popl %eax
-__pthread_do_unwind:
-__pthread_do_register:
-__pthread_do_unregister:
-	ret
-
-.weak __pthread_do_unwind
-.weak __pthread_do_register
-.weak __pthread_do_unregister
-.type __pthread_do_unwind,@function
-.type __pthread_do_register,@function
-.type __pthread_do_unregister,@function
diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index 0189f02844f1e7af23f25e273b6ff321fdbceb57..87bf8166ff85242ad890e0832cdc07c3399b7972 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -8,14 +8,18 @@ weak_alias(dummy_0, __synccall_lock);
 weak_alias(dummy_0, __synccall_unlock);
 weak_alias(dummy_0, __pthread_tsd_run_dtors);
 
-void __pthread_do_unwind(struct __ptcb *cb)
+void pthread_exit(void *result)
 {
 	pthread_t self = pthread_self();
 	int n;
 
-	if (cb->__next) {
-		self->cancelbuf = cb->__next->__next;
-		longjmp((void *)cb->__next->__jb, 1);
+	self->result = result;
+
+	while (self->cancelbuf) {
+		void (*f)(void *) = self->cancelbuf->__f;
+		void *x = self->cancelbuf->__x;
+		self->cancelbuf = self->cancelbuf->__next;
+		f(x);
 	}
 
 	__pthread_tsd_run_dtors();
@@ -39,17 +43,19 @@ void __pthread_do_unwind(struct __ptcb *cb)
 	__syscall(SYS_exit, 0);
 }
 
-void __pthread_do_register(struct __ptcb *cb)
+void __do_cleanup_push(struct __ptcb *cb, void (*f)(void *), void *x)
 {
 	struct pthread *self = pthread_self();
+	cb->__f = f;
+	cb->__x = x;
 	cb->__next = self->cancelbuf;
 	self->cancelbuf = cb;
 }
 
-void __pthread_do_unregister(struct __ptcb *cb)
+void __do_cleanup_pop(struct __ptcb *cb, int run)
 {
-	struct pthread *self = __pthread_self();
-	self->cancelbuf = self->cancelbuf->__next;
+	__pthread_self()->cancelbuf = cb->__next;
+	if (run) cb->__f(cb->__x);
 }
 
 static int start(void *p)
@@ -134,11 +140,3 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
 	*res = new;
 	return 0;
 }
-
-void pthread_exit(void *result)
-{
-	struct pthread *self = pthread_self();
-	struct __ptcb cb = { .__next = self->cancelbuf };
-	self->result = result;
-	__pthread_do_unwind(&cb);
-}