SharedCounterRWLock Class Reference

#include <evg_rwlock.h>

List of all members.

Public Member Functions
	SharedCounterRWLock ()
void	enter_read (void)
void	leave_read (void)
void	enter_write (void)
void	leave_write (void)
Static Public Member Functions
static const char *	name ()
Private Member Functions
void	yield ()
Private Attributes
volatile int	rwdata

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Detailed Description

Definition at line 25 of file evg_rwlock.h.

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Constructor & Destructor Documentation

SharedCounterRWLock::SharedCounterRWLock

(

)

[inline]

Definition at line 40 of file evg_rwlock.h.

: rwdata(0L) {}

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Member Function Documentation

void SharedCounterRWLock::yield

(

)

[inline, private]

Definition at line 32 of file evg_rwlock.h.

References thread_yield().

Referenced by enter_read(), and enter_write().

        {
                thread_yield();
        }

static const char* SharedCounterRWLock::name

(

)

[inline, static]

Definition at line 38 of file evg_rwlock.h.

{ return "Shared_Counter_Lock"; }

void SharedCounterRWLock::enter_read

(

void

)

[inline]

Definition at line 44 of file evg_rwlock.h.

References atomic_dec_return(), atomic_inc_return(), rwdata, and yield().

        {
                if(atomic_inc_return(&rwdata) & 0x80000000)
                        for(;;)
                        {
                                if(atomic_dec_return(&rwdata) & 0x80000000) yield();
                                if((atomic_inc_return(&rwdata) & 0x80000000)==0) break;
                        }
        }

void SharedCounterRWLock::leave_read

(

void

)

[inline]

Definition at line 57 of file evg_rwlock.h.

References atomic_dec(), and rwdata.

        {
                atomic_dec(&rwdata);
        }

void SharedCounterRWLock::enter_write

(

void

)

[inline]

Definition at line 65 of file evg_rwlock.h.

References atomic_cmpexch_return(), rwdata, and yield().

        {
                for(;;)
                {
                        if(atomic_cmpexch_return(&rwdata, 0x80000000, 0) == 0) break;
                        if(rwdata) yield();
                }
        }

void SharedCounterRWLock::leave_write

(

void

)

[inline]

Definition at line 77 of file evg_rwlock.h.

References atomic_and(), and rwdata.

        {
                atomic_and(&rwdata, ~0x80000000);
//              atomic_add(&rwdata, 0x80000000);
        }

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Member Data Documentation

volatile int SharedCounterRWLock::rwdata [private]

Definition at line 27 of file evg_rwlock.h.

Referenced by enter_read(), enter_write(), leave_read(), and leave_write().

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The documentation for this class was generated from the following file:

• C:/rwlock/evg_rwlock.h