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POSIX barrier implementation, take 3

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The attached patch should address all of the review comments.

Modifed change log:

Newlib:

	* libc/include/sys/features.h (_POSIX_BARRIERS): Define for Cygwin.
	* libc/include/sys/types.h (pthread_barrier_t)
	(pthread_barrierattr_t): Do not define for Cygwin.

Cygwin:

	* common.din (pthread_barrierattr_init)
	(pthread_barrierattr_setpshared, pthread_barrierattr_getpshared)
	(pthread_barrierattr_destroy, pthread_barrier_init)
	(pthread_barrier_destroy, pthread_barrier_wait): Export.
	* include/cygwin/types.h (pthread_barrierattr_t)
	(pthread_barrier_t): Declare.
	* include/pthread.h (PTHREAD_BARRIER_SERIAL_THREAD)
	(pthread_barrierattr_init, pthread_barrierattr_setpshared)
	(pthread_barrierattr_getpshared, pthread_barrierattr_destroy)
	(pthread_barrier_init, pthread_barrier_destroy)
	(pthread_barrier_wait): Declare.
	* thread.h (PTHREAD_BARRIER_MAGIC)
	(PTHREAD_BARRIERATTR_MAGIC): Define.
	(class pthread_barrierattr, class pthread_barrier): Declare.
	* thread.cc (delete_and_clear): New local helper function.
	(class pthread_barrierattr, class pthread_barrier): Implement.
	* miscfuncs.h (likely, unlikely): New macros.

--
VH
This commit is contained in:
Václav Haisman
2016-02-12 22:25:59 +01:00
committed by Corinna Vinschen
parent ef64aa4940
commit 813da84442
8 changed files with 328 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
winsup/cygwin/thread.h
View File

@ -1,3 +1,4 @@
// -*- C++ -*-
/* thread.h: Locking and threading module definitions
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009,
@ -84,6 +85,8 @@ class pinfo;
#define PTHREAD_RWLOCK_MAGIC PTHREAD_MAGIC+9
#define PTHREAD_RWLOCKATTR_MAGIC PTHREAD_MAGIC+10
#define PTHREAD_SPINLOCK_MAGIC PTHREAD_MAGIC+11
#define PTHREAD_BARRIER_MAGIC PTHREAD_MAGIC+12
#define PTHREAD_BARRIERATTR_MAGIC PTHREAD_MAGIC+13
#define MUTEX_OWNER_ANONYMOUS ((pthread_t) -1)
@ -520,6 +523,38 @@ private:
static fast_mutex cond_initialization_lock;
};
class pthread_barrierattr: public verifyable_object
{
public:
static bool is_good_object(pthread_barrierattr_t const *);
int shared;
pthread_barrierattr ();
~pthread_barrierattr ();
};
class pthread_barrier: public verifyable_object
{
public:
static bool is_good_object(pthread_barrier_t const *);
pthread_mutex_t mtx; /* Mutex protecting everything below. */
pthread_cond_t cond; /* Conditional variable to wait on. */
unsigned cnt; /* Barrier count. Threads to wait for. */
uint64_t cyc; /* Cycle count. */
unsigned wt; /* Already waiting threads count. */
int init (const pthread_barrierattr_t *, unsigned);
int wait();
int destroy ();
pthread_barrier ();
~pthread_barrier ();
};
class pthread_rwlockattr: public verifyable_object
{
public: