* thread.cc (pthread::create): Handle stackaddr as upper bound address.
Add comment. (pthread_attr_setstack): Store upper bound address in stackaddr. Explain why. (pthread_attr_getstack): Handle stackaddr as upper bound address. Add comment. (pthread_attr_setstackaddr): Add comment. (pthread_attr_getstackaddr): Add comment. (pthread_attr_getstacksize): Return default stacksize if stacksize has not been set by the application, just as on Linux. Add comment. (pthread_getattr_np): Store upper bound address in stackaddr. Explain why. * include/pthread.h: Remove outdated comment. (pthread_attr_getstackaddr): Mark as deprecated, as on Linux. (pthread_attr_setstackaddr): Ditto.
This commit is contained in:
Corinna Vinschen
parent
ee5055296a
commit
2f84de1ff5
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@ -1,3 +1,21 @@
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2014-07-16 Corinna Vinschen <corinna@vinschen.de>
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* thread.cc (pthread::create): Handle stackaddr as upper bound address.
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Add comment.
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(pthread_attr_setstack): Store upper bound address in stackaddr.
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Explain why.
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(pthread_attr_getstack): Handle stackaddr as upper bound address.
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Add comment.
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(pthread_attr_setstackaddr): Add comment.
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(pthread_attr_getstackaddr): Add comment.
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(pthread_attr_getstacksize): Return default stacksize if stacksize has
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not been set by the application, just as on Linux. Add comment.
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(pthread_getattr_np): Store upper bound address in stackaddr. Explain
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why.
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* include/pthread.h: Remove outdated comment.
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(pthread_attr_getstackaddr): Mark as deprecated, as on Linux.
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(pthread_attr_setstackaddr): Ditto.
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2014-07-15 Christopher Faylor <me.cygwin2014@cgf.cx>
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* sigproc.cc (sigproc_init): Set aside more buffer space for signal
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@ -1,7 +1,7 @@
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/* pthread.h: POSIX pthread interface
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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2007, 2011, 2012, 2013 Red Hat, Inc.
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2007, 2011, 2012, 2013, 2014 Red Hat, Inc.
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Written by Marco Fuykschot <marco@ddi.nl>
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@ -75,7 +75,8 @@ int pthread_attr_getschedparam (const pthread_attr_t *, struct sched_param *);
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int pthread_attr_getschedpolicy (const pthread_attr_t *, int *);
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int pthread_attr_getscope (const pthread_attr_t *, int *);
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int pthread_attr_getstack (const pthread_attr_t *, void **, size_t *);
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int pthread_attr_getstackaddr (const pthread_attr_t *, void **);
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int pthread_attr_getstackaddr (const pthread_attr_t *, void **)
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__attribute__ ((deprecated));
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int pthread_attr_init (pthread_attr_t *);
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int pthread_attr_setdetachstate (pthread_attr_t *, int);
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int pthread_attr_setguardsize (pthread_attr_t *, size_t);
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@ -85,12 +86,9 @@ int pthread_attr_setschedpolicy (pthread_attr_t *, int);
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int pthread_attr_setscope (pthread_attr_t *, int);
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#ifdef _POSIX_THREAD_ATTR_STACKADDR
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/* These functions may be implementable via some low level trickery. For now they are
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* Not supported or implemented. The prototypes are here so if someone greps the
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* source they will see these comments
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*/
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int pthread_attr_setstack (pthread_attr_t *, void *, size_t);
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int pthread_attr_setstackaddr (pthread_attr_t *, void *);
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int pthread_attr_setstackaddr (pthread_attr_t *, void *)
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__attribute__ ((deprecated));
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#endif
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#ifdef _POSIX_THREAD_ATTR_STACKSIZE
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@ -473,9 +473,13 @@ pthread::create (void *(*func) (void *), pthread_attr *newattr,
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arg = threadarg;
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mutex.lock ();
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win32_obj_id = CygwinCreateThread (thread_init_wrapper, this, attr.stackaddr,
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attr.stacksize ?: PTHREAD_DEFAULT_STACKSIZE,
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attr.guardsize, 0, &thread_id);
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/* stackaddr holds the uppermost stack address. See the comments in
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pthread_attr_setstack and pthread_attr_setstackaddr for a description. */
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ULONG stacksize = attr.stacksize ?: PTHREAD_DEFAULT_STACKSIZE;
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PVOID stackaddr = attr.stackaddr ? ((caddr_t) attr.stackaddr - stacksize)
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: NULL;
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win32_obj_id = CygwinCreateThread (thread_init_wrapper, this, stackaddr,
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stacksize, attr.guardsize, 0, &thread_id);
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if (!win32_obj_id)
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{
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@ -2253,7 +2257,13 @@ pthread_attr_setstack (pthread_attr_t *attr, void *addr, size_t size)
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return EINVAL;
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if (size < PTHREAD_STACK_MIN)
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return EINVAL;
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(*attr)->stackaddr = addr;
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/* The incoming address addr points to the lowest addressable byte of a
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buffer of size bytes. Due to the way pthread_attr_setstackaddr is defined
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on Linux, the lowest address ot the stack can't be reliably computed when
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using pthread_attr_setstackaddr/pthread_attr_setstacksize. Therefore we
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store the uppermost address of the stack in stackaddr. See also the
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comment in pthread_attr_setstackaddr. */
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(*attr)->stackaddr = (caddr_t) addr + size;
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(*attr)->stacksize = size;
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return 0;
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}
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@ -2263,7 +2273,9 @@ pthread_attr_getstack (const pthread_attr_t *attr, void **addr, size_t *size)
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{
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if (!pthread_attr::is_good_object (attr))
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return EINVAL;
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*addr = (*attr)->stackaddr;
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/* stackaddr holds the uppermost stack address. See the comment in
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pthread_attr_setstack. */
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*addr = (caddr_t) (*attr)->stackaddr - (*attr)->stacksize;
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*size = (*attr)->stacksize;
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return 0;
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}
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@ -2275,6 +2287,12 @@ pthread_attr_setstackaddr (pthread_attr_t *attr, void *addr)
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return EINVAL;
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if (addr == NULL)
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return EINVAL;
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/* This function is deprecated in SUSv4, but SUSv3 didn't define
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if the incoming stack address is the lowest address of the memory
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area defined as stack, or if it's the start address of the stack
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at which it begins its growth. On Linux it's the latter which
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means the uppermost stack address on x86 based systems. See comment
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in pthread_attr_setstack as well. */
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(*attr)->stackaddr = addr;
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return 0;
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}
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@ -2284,6 +2302,7 @@ pthread_attr_getstackaddr (const pthread_attr_t *attr, void **addr)
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{
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if (!pthread_attr::is_good_object (attr))
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return EINVAL;
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/* See comment in pthread_attr_setstackaddr. */
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*addr = (*attr)->stackaddr;
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return 0;
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}
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@ -2304,7 +2323,10 @@ pthread_attr_getstacksize (const pthread_attr_t *attr, size_t *size)
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{
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if (!pthread_attr::is_good_object (attr))
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return EINVAL;
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*size = (*attr)->stacksize;
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/* If the stacksize has not been set by the application, return the
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default stacksize. Note that this is different from what
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pthread_attr_getstack returns. */
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*size = (*attr)->stacksize ?: PTHREAD_DEFAULT_STACKSIZE;
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return 0;
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}
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@ -2486,10 +2508,12 @@ pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
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if (NT_SUCCESS (status))
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{
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PTEB teb = (PTEB) tbi->TebBaseAddress;
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(*attr)->stackaddr = teb->DeallocationStack ?: teb->Tib.StackLimit;
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/* stack grows downwards on x86 systems */
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/* stackaddr holds the uppermost stack address. See the comments
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in pthread_attr_setstack and pthread_attr_setstackaddr for a
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description. */
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(*attr)->stackaddr = teb->Tib.StackBase;
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(*attr)->stacksize = (uintptr_t) teb->Tib.StackBase
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- (uintptr_t) (*attr)->stackaddr;
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- (uintptr_t) (teb->DeallocationStack ?: teb->Tib.StackLimit);
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}
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else
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{
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