Re: Locks
Re: Locks
- Subject: Re: Locks
- From: Ian Joyner <email@hidden>
- Date: Sat, 10 Dec 2011 10:48:58 +1100
You are probably looking for something like Dahm locks (invented by Dave Dahm on the Burroughs B5000 in the 1960s). Here is a long paper on locks including this origin:
http://pages.cs.wisc.edu/~remzi/OSFEP/threads-locks.pdf
Here is an idea of the ALGOL define for acquire:
DEFINE
ACQUIRELOCK (ID) =
BEGIN
IF READLOCK (PROCESSID, CONTENDERS[ID]) ^= 0 THEN
DO
PROCURE (LOCKS[ID])
UNTIL READLOCK (-1, CONTENDERS[ID]) = 0;
OWNERS [ID] := PROCESSID;
END #
On 7 Dec 2011, at 10:28, koko wrote:
> In windows we have:
>
> LONG volatile Mylock = 0;
> InterlockedIncrement(&Mylock);
> InterlockedDecrement(&Mylock);
>
>
> What should these be replaced with for OSX as in :
>
> #ifndef MAC
> LONG volatile Mylock = 0;
> #else
> // Mac
> #endif
>
>
> void SetLock()
> {
> // EnterCriticalSection(&m_cs);
> #ifndef MAC
> while(Mylock){Sleep(0);}; // Give up timeslice
> InterlockedIncrement(&Mylock);
> #else
> // Mac
> #endif
> }
>
>
> void FreeLock()
> {
> // LeaveCriticalSection(&m_cs);
> #ifndef MAC
> InterlockedDecrement(&Mylock);
> #else
> // Mac
> #endif
> }
>
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| References: | |
| | >Locks (From: koko <email@hidden>) |