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259 lines
9.1 KiB
Diff
259 lines
9.1 KiB
Diff
From fd2100138729eece59f3af37c59ee6b166085cc6 Mon Sep 17 00:00:00 2001
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From: Zebediah Figura <z.figura12@gmail.com>
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Date: Mon, 31 Aug 2020 23:38:09 -0500
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Subject: [PATCH] ntdll: Reimplement the critical section fast path on top of
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Win32 futexes.
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Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
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---
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dlls/ntdll/sync.c | 35 +++++++----
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dlls/ntdll/unix/loader.c | 3 -
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dlls/ntdll/unix/sync.c | 109 ---------------------------------
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dlls/ntdll/unix/unix_private.h | 3 -
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dlls/ntdll/unixlib.h | 5 +-
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5 files changed, 24 insertions(+), 131 deletions(-)
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diff --git a/dlls/ntdll/sync.c b/dlls/ntdll/sync.c
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index 09975ac3d45..97a5ce7fffa 100644
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--- a/dlls/ntdll/sync.c
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+++ b/dlls/ntdll/sync.c
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@@ -765,19 +765,26 @@ static inline HANDLE get_semaphore( RTL_CRITICAL_SECTION *crit )
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static inline NTSTATUS wait_semaphore( RTL_CRITICAL_SECTION *crit, int timeout )
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{
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- NTSTATUS ret;
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+ LARGE_INTEGER time = {.QuadPart = timeout * (LONGLONG)-10000000};
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/* debug info is cleared by MakeCriticalSectionGlobal */
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- if (!crit_section_has_debuginfo( crit ) ||
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- ((ret = unix_funcs->fast_RtlpWaitForCriticalSection( crit, timeout )) == STATUS_NOT_IMPLEMENTED))
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+ if (!crit_section_has_debuginfo( crit ))
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{
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HANDLE sem = get_semaphore( crit );
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- LARGE_INTEGER time;
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-
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- time.QuadPart = timeout * (LONGLONG)-10000000;
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- ret = NtWaitForSingleObject( sem, FALSE, &time );
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+ return NtWaitForSingleObject( sem, FALSE, &time );
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+ }
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+ else
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+ {
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+ int *lock = (int *)&crit->LockSemaphore;
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+ while (!InterlockedCompareExchange( lock, 0, 1 ))
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+ {
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+ static const int zero;
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+ /* this may wait longer than specified in case of multiple wake-ups */
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+ if (RtlWaitOnAddress( lock, &zero, sizeof(int), &time ) == STATUS_TIMEOUT)
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+ return STATUS_TIMEOUT;
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+ }
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+ return STATUS_WAIT_0;
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}
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- return ret;
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}
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/******************************************************************************
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@@ -867,8 +874,6 @@ NTSTATUS WINAPI RtlDeleteCriticalSection( RTL_CRITICAL_SECTION *crit )
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RtlFreeHeap( GetProcessHeap(), 0, crit->DebugInfo );
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crit->DebugInfo = NULL;
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}
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- if (unix_funcs->fast_RtlDeleteCriticalSection( crit ) == STATUS_NOT_IMPLEMENTED)
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- NtClose( crit->LockSemaphore );
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}
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else NtClose( crit->LockSemaphore );
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crit->LockSemaphore = 0;
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@@ -944,12 +949,18 @@ NTSTATUS WINAPI RtlpUnWaitCriticalSection( RTL_CRITICAL_SECTION *crit )
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NTSTATUS ret;
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/* debug info is cleared by MakeCriticalSectionGlobal */
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- if (!crit_section_has_debuginfo( crit ) ||
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- ((ret = unix_funcs->fast_RtlpUnWaitCriticalSection( crit )) == STATUS_NOT_IMPLEMENTED))
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+ if (!crit_section_has_debuginfo( crit ))
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{
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HANDLE sem = get_semaphore( crit );
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ret = NtReleaseSemaphore( sem, 1, NULL );
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}
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+ else
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+ {
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+ int *lock = (int *)&crit->LockSemaphore;
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+ InterlockedExchange( lock, 1 );
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+ RtlWakeAddressSingle( lock );
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+ ret = STATUS_SUCCESS;
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+ }
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if (ret) RtlRaiseStatus( ret );
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return ret;
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}
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diff --git a/dlls/ntdll/unix/loader.c b/dlls/ntdll/unix/loader.c
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index a962eb46ead..6748c89ccac 100644
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--- a/dlls/ntdll/unix/loader.c
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+++ b/dlls/ntdll/unix/loader.c
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@@ -1757,9 +1757,6 @@ static struct unix_funcs unix_funcs =
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#endif
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DbgUiIssueRemoteBreakin,
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RtlGetSystemTimePrecise,
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- fast_RtlpWaitForCriticalSection,
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- fast_RtlpUnWaitCriticalSection,
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- fast_RtlDeleteCriticalSection,
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fast_RtlTryAcquireSRWLockExclusive,
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fast_RtlAcquireSRWLockExclusive,
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fast_RtlTryAcquireSRWLockShared,
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diff --git a/dlls/ntdll/unix/sync.c b/dlls/ntdll/unix/sync.c
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index 41005425a90..6b97028fb68 100644
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--- a/dlls/ntdll/unix/sync.c
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+++ b/dlls/ntdll/unix/sync.c
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@@ -2409,115 +2409,6 @@ NTSTATUS WINAPI NtWaitForAlertByThreadId( const void *address, const LARGE_INTEG
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}
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-#ifdef __linux__
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-
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-NTSTATUS CDECL fast_RtlpWaitForCriticalSection( RTL_CRITICAL_SECTION *crit, int timeout )
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-{
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- int val;
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- struct timespec timespec;
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-
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- if (!use_futexes()) return STATUS_NOT_IMPLEMENTED;
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-
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- timespec.tv_sec = timeout;
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- timespec.tv_nsec = 0;
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- while ((val = InterlockedCompareExchange( (int *)&crit->LockSemaphore, 0, 1 )) != 1)
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- {
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- /* note: this may wait longer than specified in case of signals or */
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- /* multiple wake-ups, but that shouldn't be a problem */
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- if (futex_wait( (int *)&crit->LockSemaphore, val, ×pec ) == -1 && errno == ETIMEDOUT)
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- return STATUS_TIMEOUT;
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- }
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- return STATUS_WAIT_0;
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-}
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-
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-NTSTATUS CDECL fast_RtlpUnWaitCriticalSection( RTL_CRITICAL_SECTION *crit )
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-{
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- if (!use_futexes()) return STATUS_NOT_IMPLEMENTED;
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-
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- *(int *)&crit->LockSemaphore = 1;
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- futex_wake( (int *)&crit->LockSemaphore, 1 );
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- return STATUS_SUCCESS;
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-}
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-
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-NTSTATUS CDECL fast_RtlDeleteCriticalSection( RTL_CRITICAL_SECTION *crit )
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-{
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- if (!use_futexes()) return STATUS_NOT_IMPLEMENTED;
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- return STATUS_SUCCESS;
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-}
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-
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-#elif defined(__APPLE__)
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-
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-static inline semaphore_t get_mach_semaphore( RTL_CRITICAL_SECTION *crit )
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-{
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- semaphore_t ret = *(int *)&crit->LockSemaphore;
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- if (!ret)
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- {
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- semaphore_t sem;
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- if (semaphore_create( mach_task_self(), &sem, SYNC_POLICY_FIFO, 0 )) return 0;
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- if (!(ret = InterlockedCompareExchange( (int *)&crit->LockSemaphore, sem, 0 )))
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- ret = sem;
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- else
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- semaphore_destroy( mach_task_self(), sem ); /* somebody beat us to it */
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- }
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- return ret;
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-}
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-
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-NTSTATUS CDECL fast_RtlpWaitForCriticalSection( RTL_CRITICAL_SECTION *crit, int timeout )
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-{
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- mach_timespec_t timespec;
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- semaphore_t sem = get_mach_semaphore( crit );
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-
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- timespec.tv_sec = timeout;
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- timespec.tv_nsec = 0;
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- for (;;)
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- {
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- switch( semaphore_timedwait( sem, timespec ))
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- {
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- case KERN_SUCCESS:
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- return STATUS_WAIT_0;
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- case KERN_ABORTED:
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- continue; /* got a signal, restart */
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- case KERN_OPERATION_TIMED_OUT:
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- return STATUS_TIMEOUT;
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- default:
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- return STATUS_INVALID_HANDLE;
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- }
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- }
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-}
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-
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-NTSTATUS CDECL fast_RtlpUnWaitCriticalSection( RTL_CRITICAL_SECTION *crit )
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-{
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- semaphore_t sem = get_mach_semaphore( crit );
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- semaphore_signal( sem );
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- return STATUS_SUCCESS;
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-}
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-
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-NTSTATUS CDECL fast_RtlDeleteCriticalSection( RTL_CRITICAL_SECTION *crit )
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-{
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- semaphore_destroy( mach_task_self(), *(int *)&crit->LockSemaphore );
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- return STATUS_SUCCESS;
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-}
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-
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-#else /* __APPLE__ */
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-
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-NTSTATUS CDECL fast_RtlpWaitForCriticalSection( RTL_CRITICAL_SECTION *crit, int timeout )
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-{
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- return STATUS_NOT_IMPLEMENTED;
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-}
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-
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-NTSTATUS CDECL fast_RtlpUnWaitCriticalSection( RTL_CRITICAL_SECTION *crit )
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-{
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- return STATUS_NOT_IMPLEMENTED;
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-}
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-
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-NTSTATUS CDECL fast_RtlDeleteCriticalSection( RTL_CRITICAL_SECTION *crit )
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-{
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- return STATUS_NOT_IMPLEMENTED;
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-}
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-
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-#endif
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-
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-
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#ifdef __linux__
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/* Futex-based SRW lock implementation:
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diff --git a/dlls/ntdll/unix/unix_private.h b/dlls/ntdll/unix/unix_private.h
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index 8d80b824d28..8141554a7cd 100644
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--- a/dlls/ntdll/unix/unix_private.h
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+++ b/dlls/ntdll/unix/unix_private.h
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@@ -105,9 +105,6 @@ extern void (WINAPI *pKiUserApcDispatcher)(CONTEXT*,ULONG_PTR,ULONG_PTR,ULON
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extern NTSTATUS (WINAPI *pKiUserExceptionDispatcher)(EXCEPTION_RECORD*,CONTEXT*) DECLSPEC_HIDDEN;
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extern void (WINAPI *pLdrInitializeThunk)(CONTEXT*,void**,ULONG_PTR,ULONG_PTR) DECLSPEC_HIDDEN;
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extern void (WINAPI *pRtlUserThreadStart)( PRTL_THREAD_START_ROUTINE entry, void *arg ) DECLSPEC_HIDDEN;
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-extern NTSTATUS CDECL fast_RtlpWaitForCriticalSection( RTL_CRITICAL_SECTION *crit, int timeout ) DECLSPEC_HIDDEN;
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-extern NTSTATUS CDECL fast_RtlpUnWaitCriticalSection( RTL_CRITICAL_SECTION *crit ) DECLSPEC_HIDDEN;
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-extern NTSTATUS CDECL fast_RtlDeleteCriticalSection( RTL_CRITICAL_SECTION *crit ) DECLSPEC_HIDDEN;
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extern NTSTATUS CDECL fast_RtlTryAcquireSRWLockExclusive( RTL_SRWLOCK *lock ) DECLSPEC_HIDDEN;
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extern NTSTATUS CDECL fast_RtlAcquireSRWLockExclusive( RTL_SRWLOCK *lock ) DECLSPEC_HIDDEN;
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extern NTSTATUS CDECL fast_RtlTryAcquireSRWLockShared( RTL_SRWLOCK *lock ) DECLSPEC_HIDDEN;
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diff --git a/dlls/ntdll/unixlib.h b/dlls/ntdll/unixlib.h
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index 72d115a556b..d7c880eda04 100644
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--- a/dlls/ntdll/unixlib.h
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+++ b/dlls/ntdll/unixlib.h
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@@ -37,7 +37,7 @@ enum loadorder
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};
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/* increment this when you change the function table */
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-#define NTDLL_UNIXLIB_VERSION 120
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+#define NTDLL_UNIXLIB_VERSION 121
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struct unix_funcs
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{
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@@ -51,9 +51,6 @@ struct unix_funcs
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LONGLONG (WINAPI *RtlGetSystemTimePrecise)(void);
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/* fast locks */
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- NTSTATUS (CDECL *fast_RtlpWaitForCriticalSection)( RTL_CRITICAL_SECTION *crit, int timeout );
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- NTSTATUS (CDECL *fast_RtlpUnWaitCriticalSection)( RTL_CRITICAL_SECTION *crit );
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- NTSTATUS (CDECL *fast_RtlDeleteCriticalSection)( RTL_CRITICAL_SECTION *crit );
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NTSTATUS (CDECL *fast_RtlTryAcquireSRWLockExclusive)( RTL_SRWLOCK *lock );
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NTSTATUS (CDECL *fast_RtlAcquireSRWLockExclusive)( RTL_SRWLOCK *lock );
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NTSTATUS (CDECL *fast_RtlTryAcquireSRWLockShared)( RTL_SRWLOCK *lock );
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--
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2.30.2
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