66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
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#include <nt.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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#include <precomp.h>
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#include <locks.h>
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#ifdef _WIN32_WINNT
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#if _WIN32_WINNT > 0x0400
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ReaderWriter::ReaderWriter(bool can_throw) : initialized_(false), can_throw_(can_throw)
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{
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C_ASSERT(sizeof(::RTL_RESOURCE)==sizeof(ReaderWriter::RTL_RESOURCE));
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__try
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{
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RtlInitializeResource((::RTL_RESOURCE*)&lock_);
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initialized_ = true;
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}
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__except(GetExceptionCode() == STATUS_NO_MEMORY)
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{
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}
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if (initialized_ != true)
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raise_exception();
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}
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ReaderWriter::~ReaderWriter (void)
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{ if (initialized_) RtlDeleteResource((::RTL_RESOURCE*)&lock_);}
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bool
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ReaderWriter::acquire (void)
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{ return (RtlAcquireResourceExclusive((::RTL_RESOURCE*)&lock_,TRUE)==TRUE);}
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bool
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ReaderWriter::tryacquire (void)
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{ return (RtlAcquireResourceExclusive((::RTL_RESOURCE*)&lock_,FALSE)==TRUE);}
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bool
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ReaderWriter::release (void)
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{ RtlReleaseResource((::RTL_RESOURCE*)&lock_); return 0;}
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bool
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ReaderWriter::acquire_read (void)
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{ return (RtlAcquireResourceShared((::RTL_RESOURCE*)&lock_,TRUE)==TRUE);}
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bool
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ReaderWriter::acquire_write (void)
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{ return (RtlAcquireResourceExclusive((::RTL_RESOURCE*)&lock_,TRUE)==TRUE);}
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bool
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ReaderWriter::tryacquire_read (void)
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{ return (RtlAcquireResourceShared((::RTL_RESOURCE*)&lock_,FALSE)==TRUE);}
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bool
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ReaderWriter::tryacquire_write (void)
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{ return (RtlAcquireResourceExclusive((::RTL_RESOURCE*)&lock_,FALSE)==TRUE);}
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void
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ReaderWriter::downgrade()
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{ RtlConvertExclusiveToShared((::RTL_RESOURCE*)&lock_);}
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void
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ReaderWriter::upgrade()
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{ RtlConvertSharedToExclusive((::RTL_RESOURCE*)&lock_);}
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#endif
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#endif
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