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* ntdll.h (struct _SEMAPHORE_BASIC_INFORMATION): Define.

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(enum _SEMAPHORE_INFORMATION_CLASS): Define.
	(NtQuerySemaphore): Declare.
	* thread.h (class semaphore): Add member startvalue.
	(semaphore::fixup_before_fork): New inline method.
	(semaphore::_fixup_before_fork): Declare.
	* thread.cc (MTinterface::fixup_before_fork): Additionally call
	semaphore::fixup_before_fork.
	(semaphore::semaphore): Set currentvalue to -1.  Set startvalue to
	incoming initializer value.
	(semaphore::_getvalue): Just query semaphore using NtQuerySemaphore
	rather then using WFSO/Release.
	(semaphore::_post): Drop setting currentvalue.  It's not thread-safe.
	(semaphore::_trywait): Ditto.
	(semaphore::_timedwait): Ditto.
	(semaphore::_wait): Ditto.
	(semaphore::_fixup_before_fork): New method, setting currentvalue from
	actual windows semaphore right before fork.
	(semaphore::_fixup_after_fork): Drop kludge from 2013-07-10.  Drop
	FIXME comment.
This commit is contained in:
Corinna Vinschen
2013-07-23 14:15:20 +00:00
parent 6c1f4d7d64
commit 16efa64721
4 changed files with 74 additions and 27 deletions
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14
winsup/cygwin/ntdll.h
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@@ -1102,6 +1102,18 @@ typedef enum _EVENT_INFORMATION_CLASS
EventBasicInformation = 0
} EVENT_INFORMATION_CLASS, *PEVENT_INFORMATION_CLASS;
/* Checked on 64 bit. */
typedef struct _SEMAPHORE_BASIC_INFORMATION
{
LONG CurrentCount;
LONG MaximumCount;
} SEMAPHORE_BASIC_INFORMATION, *PSEMAPHORE_BASIC_INFORMATION;
typedef enum _SEMAPHORE_INFORMATION_CLASS
{
SemaphoreBasicInformation = 0
} SEMAPHORE_INFORMATION_CLASS, *PSEMAPHORE_INFORMATION_CLASS;
typedef enum _THREAD_INFORMATION_CLASS
{
ThreadBasicInformation = 0,
@@ -1275,6 +1287,8 @@ extern "C"
PVOID, ULONG, PULONG);
NTSTATUS NTAPI NtQueryObject (HANDLE, OBJECT_INFORMATION_CLASS, VOID *,
ULONG, ULONG *);
NTSTATUS NTAPI NtQuerySemaphore (HANDLE, SEMAPHORE_INFORMATION_CLASS,
PVOID, ULONG, PULONG);
NTSTATUS NTAPI NtQuerySystemInformation (SYSTEM_INFORMATION_CLASS,
PVOID, ULONG, PULONG);
NTSTATUS WINAPI NtQuerySystemTime (PLARGE_INTEGER);