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[/] [mips32r1/] [trunk/] [Software/] [demos/] [XD5_Threads/] [src/] [os/] [lock.c] - Blame information for rev 4

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1 2 ayersg 
#include <stdlib.h> /* only for NULL */
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#include "lock.h"
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void Lock(volatile int *lock, int *load_count, int *store_count)
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{
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        int l_tries = 0;
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        int s_tries = 0;
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        asm volatile(
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                ".set noreorder\n\t"
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                "addiu  $8, $0, 1\n\t"
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                "addu   %[l_tries], $0, $0\n\t"
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                "addu   %[s_tries], $0, $0\n\t"
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                "1:\n\t"
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                "ll     $9, %[lock]\n\t"
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                "bne    $9, $0, 1b\n\t"
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                "addiu  %[l_tries], %[l_tries], 1\n\t"
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                "sc     $8, %[lock]\n\t"
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                "beq    $8, $0, 1b\n\t"
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                "addiu  %[s_tries], %[s_tries], 1\n\t"
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                ".set reorder\n\t"
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                : [l_tries] "=&r"(l_tries), [s_tries] "=&r"(s_tries),
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                [lock] "+m"(*lock)
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                :
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                : "$8", "$9", "memory"
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        );
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        if (load_count != NULL) {
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                *load_count = l_tries;
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        }
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        if (store_count != NULL) {
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                *store_count = s_tries;
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        }
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}
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void LockAlmost(volatile int *lock, int *load_count, int *store_count)
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{
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        int l_tries = 0;
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        int s_tries = 0;
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        asm volatile(
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                ".set noreorder\n\t"
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                "addiu  $8, $0, 1\n\t"
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                "addu   %[l_tries], $0, $0\n\t"
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                "addu   %[s_tries], $0, $0\n\t"
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                "1:\n\t"
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                "ll     $9, %[lock]\n\t"
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                "bne    $9, $0, 1b\n\t"
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                "addiu  %[l_tries], %[l_tries], 1\n\t"
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                "nop\n\t"
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                "nop\n\t"
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                "sc     $8, %[lock]\n\t"
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                "addiu  %[s_tries], %[s_tries], 1\n\t"
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                ".set reorder\n\t"
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                : [l_tries] "=&r"(l_tries), [s_tries] "=&r"(s_tries),
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                [lock] "+m"(*lock)
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                :
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                : "$8", "$9", "memory"
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        );
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        if (load_count != NULL) {
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                *load_count = l_tries;
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        }
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        if (store_count != NULL) {
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                *store_count = s_tries;
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        }
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}
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void LockNull(volatile int *lock, int *load_count, int *store_count)
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{
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        if (load_count != NULL) {
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                *load_count = 1;
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        }
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        if (store_count != NULL) {
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                *store_count = 1;
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        }
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}
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void Unlock(volatile int *lock)
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{
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        *lock = 0;
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}
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