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Implement cancellation points in libc interfaces, as specified by POSIX.

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This commit is contained in:
mtm 2004-09-16 13:55:46 +00:00
parent a64f45cafb
commit 3626bc4706
2 changed files with 314 additions and 0 deletions
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21
lib/libthr/thread/thr_private.h
View File

@ -52,6 +52,7 @@
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/msg.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <pthread_np.h>
@ -833,6 +834,12 @@ int __sys_kevent(int, const struct kevent *, int, struct kevent *,
int __sys_ioctl(int, unsigned long, ...);
#endif
/* #include <sys/msg.h> */
#ifdef _SYS_MSG_H_
int __sys_msgrcv(int, void *, size_t, long, int);
int __sys_msgsnd(int, const void *, size_t, int);
#endif
/* #include <sys/mman.h> */
#ifdef _SYS_MMAN_H_
int __sys_msync(void *, size_t, int);
@ -852,6 +859,7 @@ int __sys_getpeername(int, struct sockaddr *, socklen_t *);
int __sys_getsockname(int, struct sockaddr *, socklen_t *);
int __sys_getsockopt(int, int, int, void *, socklen_t *);
int __sys_listen(int, int);
ssize_t __sys_recv(int, void *, size_t, int);
ssize_t __sys_recvfrom(int, void *, size_t, int, struct sockaddr *, socklen_t *);
ssize_t __sys_recvmsg(int, struct msghdr *, int);
int __sys_sendfile(int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
@ -898,12 +906,23 @@ int __sys_open(const char *, int, ...);
int __sys_poll(struct pollfd *, unsigned, int);
#endif
/* #include <semaphore.h> */
#ifdef _SEMAPHORE_H_
int __sem_timedwait(sem_t * __restrict, const struct timespec * __restrict);
int __sem_wait(sem_t *);
#endif
/* #include <signal.h> */
#ifdef _SIGNAL_H_
int __sys_sigaction(int, const struct sigaction *, struct sigaction *);
int __sys_sigaltstack(const struct sigaltstack *, struct sigaltstack *);
int __sys_sigprocmask(int, const sigset_t *, sigset_t *);
int __sys_sigreturn(ucontext_t *);
int __sys_sigsuspend(const sigset_t *);
int __sys_sigtimedwait(const sigset_t * __restrict, siginfo_t * __restrict,
const struct timespec * __restrict);
int __sys_sigwait(const sigset_t * __restrict, int * __restrict);
int __sys_sigwaitinfo(const sigset_t * __restrict, siginfo_t * __restrict);
#endif
/* #include <unistd.h> */
@ -918,6 +937,8 @@ pid_t __sys_fork(void);
long __sys_fpathconf(int, int);
int __sys_fsync(int);
int __sys_pipe(int *);
ssize_t __sys_pread(int, void *, size_t, off_t);
ssize_t __sys_pwrite(int, const void *, size_t, off_t);
ssize_t __sys_read(int, void *, size_t);
ssize_t __sys_write(int, const void *, size_t);
#endif

293
lib/libthr/thread/thr_syscalls.c
View File

@ -69,6 +69,7 @@
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
@ -80,6 +81,7 @@
#include <fcntl.h>
#include <poll.h>
#include <pthread.h>
#include <semaphore.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
@ -103,6 +105,19 @@ extern pid_t __wait(int *);
extern pid_t __sys_wait4(pid_t, int *, int, struct rusage *);
extern pid_t __waitpid(pid_t, int *, int);
__weak_reference(_accept, accept);
int
_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_accept(s, addr, addrlen);
_thread_leave_cancellation_point();
return (ret);
}
__weak_reference(_aio_suspend, aio_suspend);
int
@ -131,6 +146,20 @@ _close(int fd)
return ret;
}
__weak_reference(_connect, connect);
int
_connect(int s, const struct sockaddr *n, socklen_t l)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_connect(s, n, l);
_thread_leave_cancellation_point();
return ret;
}
__weak_reference(_creat, creat);
int
@ -246,6 +275,32 @@ _fsync(int fd)
return ret;
}
__weak_reference(_msgrcv, msgrcv);
int
_msgrcv(int id, void *p, size_t sz, long t, int f)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_msgrcv(id, p, sz, t, f);
_thread_leave_cancellation_point();
return ret;
}
__weak_reference(_msgsnd, msgsnd);
int
_msgsnd(int id, const void *p, size_t sz, int f)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_msgsnd(id, p, sz, f);
_thread_leave_cancellation_point();
return ret;
}
__weak_reference(_msync, msync);
int
@ -300,6 +355,22 @@ _open(const char *path, int flags,...)
return ret;
}
/*
* The implementation in libc calls sigpause(), which is also
* a cancellation point.
*/
#if 0
__weak_reference(_pause, pause);
int
_pause(void)
{
_thread_enter_cancellation_point();
__pause();
_thread_leave_cancellation_point();
}
#endif
__weak_reference(_poll, poll);
int
@ -314,6 +385,24 @@ _poll(struct pollfd *fds, unsigned int nfds, int timeout)
return ret;
}
/* XXXFix */
#if 0
__weak_reference(_pread, pread);
ssize_t
_pread(int d, void *b, size_t n, off_t o)
{
ssize_t ret;
_thread_enter_cancellation_point();
ret = __sys_pread(d, b, n, o);
_thread_leave_cancellation_point();
return (ret);
}
#endif
/* The libc version calls select(), which is also a cancellation point. */
#if 0
extern int __pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds,
const struct timespec *timo, const sigset_t *mask);
@ -329,6 +418,23 @@ pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds,
return (ret);
}
#endif
/* XXXFix */
#if 0
__weak_reference(_pwrite, pwrite);
ssize_t
_pwrite(int d, const void *b, size_t n, off_t o)
{
ssize_t ret;
_thread_enter_cancellation_point();
ret = __sys_pwrite(d, b, n, o);
_thread_leave_cancellation_point();
return (ret);
}
#endif
__weak_reference(_raise, raise);
@ -373,6 +479,52 @@ _readv(int fd, const struct iovec *iov, int iovcnt)
return ret;
}
/*
* The libc implementation of recv() calls recvfrom, which
* is also a cancellation point.
*/
#if 0
__weak_reference(_recv, recv);
ssize_t
_recv(int s, void *b, size_t l, int f)
{
ssize_t ret;
_thread_enter_cancellation_point();
ret = __sys_recv(s, b, l, f);
_thread_leave_cancellation_point();
return (ret);
}
#endif
__weak_reference(_recvfrom, recvfrom);
ssize_t
_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from,
socklen_t *fl)
{
ssize_t ret;
_thread_enter_cancellation_point();
ret = __sys_recvfrom(s, b, l, f, from, fl);
_thread_leave_cancellation_point();
return (ret);
}
__weak_reference(_recvmsg, recvmsg);
ssize_t
_recvmsg(int s, struct msghdr *m, int f)
{
ssize_t ret;
_thread_enter_cancellation_point();
ret = __sys_recvmsg(s, m, f);
_thread_leave_cancellation_point();
return (ret);
}
__weak_reference(_select, select);
int
@ -388,6 +540,123 @@ _select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
return ret;
}
/*
* Libc implements this by calling _sendto(), which is also a
* cancellation point.
*/
#if 0
__weak_reference(_send, send);
ssize_t
_send(int s, const void *m, size_t l, int f)
{
ssize_t ret;
_thread_enter_cancellation_point();
ret = _sendto(s, m, l, f, NULL, 0);
_thread_leave_cancellation_point();
return (ret);
}
#endif
__weak_reference(_sendmsg, sendmsg);
ssize_t
_sendmsg(int s, const struct msghdr *m, int f)
{
ssize_t ret;
_thread_enter_cancellation_point();
ret = __sys_sendmsg(s, m, f);
_thread_leave_cancellation_point();
return (ret);
}
__weak_reference(_sendto, sendto);
ssize_t
_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t,
socklen_t tl)
{
ssize_t ret;
_thread_enter_cancellation_point();
ret = __sys_sendto(s, m, l, f, t, tl);
_thread_leave_cancellation_point();
return (ret);
}
/*
* The implementation in libc calls sigsuspend(), which is also
* a cancellation point.
*/
#if 0
__weak_reference(_sigpause, sigpause);
int
_sigpause(int m)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_sigpause(m);
_thread_leave_cancellation_point();
return (ret);
}
#endif
__weak_reference(_sigsuspend, sigsuspend);
int
_sigsuspend(const sigset_t *m)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_sigsuspend(m);
_thread_leave_cancellation_point();
return (ret);
}
__weak_reference(_sigtimedwait, sigtimedwait);
int
_sigtimedwait(const sigset_t *s, siginfo_t *i, const struct timespec *t)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_sigtimedwait(s, i, t);
_thread_leave_cancellation_point();
return (ret);
}
__weak_reference(_sigwait, sigwait);
int
_sigwait(const sigset_t *s, int *i)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_sigwait(s, i);
_thread_leave_cancellation_point();
return (ret);
}
__weak_reference(_sigwaitinfo, sigwaitinfo);
int
_sigwaitinfo(const sigset_t *s, siginfo_t *i)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_sigwaitinfo(s, i);
_thread_leave_cancellation_point();
return (ret);
}
__weak_reference(_sleep, sleep);
unsigned int
@ -431,6 +700,25 @@ _tcdrain(int fd)
return ret;
}
/*
* The usleep() implementation calls nanosleep(), which is also
* a cancellation point.
*/
#if 0
__weak_reference(_usleep, usleep);
int
_usleep(useconds_t u)
{
int ret;
_thread_enter_cancellation_point();
ret = __sys_usleep(u);
_thread_leave_cancellation_point();
return (ret);
}
#endif
__weak_reference(_wait, wait);
pid_t
@ -459,6 +747,10 @@ _wait4(pid_t pid, int *istat, int options, struct rusage *rusage)
return ret;
}
/*
* The libc implementation of waitpid calls wait4().
*/
#if 0
__weak_reference(_waitpid, waitpid);
pid_t
@ -472,6 +764,7 @@ _waitpid(pid_t wpid, int *status, int options)
return ret;
}
#endif
__weak_reference(_write, write);