Re: Shared Memory (Semaphore and mutex)

• Subject: Re: Shared Memory (Semaphore and mutex)
• From: Shaun Wexler <email@hidden>
• Date: Fri, 1 Oct 2004 18:25:16 -0700
• Delivered-to: email@hidden
• Delivered-to: email@hidden

On Oct 1, 2004, at 1:42 PM, Marc Colosimo wrote:

Let's take a simple case, I want to set a lock (based on the assembly in PowerPC book):

    __asm__ __volatile__
    (
    "\n"
    "_lock_1:\n"
    "   lwarx  %0,0,%1 \n"     // load lock and reserve
    "   addi   %0,0,1  \n"     // set lock (1 is locked)
    "   stwcx. %0,0,%1 \n"     // try to set lock
    "   bne-   _lock_1 \n"   // loop if lost reservation
    "   isync      \n"         // import barrier
    : "=&r" (_t)
    : "r"   (__count)
    : "cc", "memory"
    );

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