80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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eballoc.c
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Abstract:
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Process/Thread Environment Block allocation functions
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Author:
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Steve Wood (stevewo) 10-May-1990
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Revision History:
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--*/
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#include "ntrtlp.h"
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#include <nturtl.h>
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#if defined(ALLOC_PRAGMA) && defined(NTOS_KERNEL_RUNTIME)
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#pragma alloc_text(PAGE,RtlAcquirePebLock)
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#pragma alloc_text(PAGE,RtlReleasePebLock)
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#endif
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typedef VOID (*PEB_LOCK_ROUTINE)(PVOID FastLock);
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VOID
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RtlAcquirePebLock( VOID )
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{
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PEB_LOCK_ROUTINE LockRoutine;
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PPEB Peb;
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LARGE_INTEGER Timeout;
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RTL_PAGED_CODE();
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Peb = NtCurrentPeb();
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LockRoutine = (PEB_LOCK_ROUTINE)Peb->FastPebLockRoutine;
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ASSERT(LockRoutine);
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for (;;) {
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try {
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(LockRoutine)(Peb->FastPebLock);
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break;
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} except ( GetExceptionCode() == STATUS_INSUFFICIENT_RESOURCES
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? EXCEPTION_EXECUTE_HANDLER
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: EXCEPTION_CONTINUE_SEARCH ) {
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//
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// Unfortunately, a number of things assume that
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// RtlAcquirePebLock can't fail. So we need to loop and
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// try again.
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//
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Timeout.QuadPart = UInt32x32To64( 10 /* Milliseconds to sleep */,
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10000 /* Milliseconds to 100 Nanoseconds) */);
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Timeout.QuadPart *= -1; /* Make it a relative time */
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NtDelayExecution(FALSE, &Timeout);
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continue;
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}
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}
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}
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VOID
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RtlReleasePebLock( VOID )
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{
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PEB_LOCK_ROUTINE LockRoutine;
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PPEB Peb;
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RTL_PAGED_CODE();
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Peb = NtCurrentPeb();
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LockRoutine = (PEB_LOCK_ROUTINE)Peb->FastPebUnlockRoutine;
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ASSERT(LockRoutine);
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(LockRoutine)(Peb->FastPebLock);
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}
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