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/* Machine-dependent pthreads configuration and inline functions. * * Copyright (C) 2005-2007 Atmel Corporation * * This file is subject to the terms and conditions of the GNU Lesser General * Public License. See the file "COPYING.LIB" in the main directory of this * archive for more details. */ #ifndef _PT_MACHINE_H #define _PT_MACHINE_H 1 #include <features.h> #ifndef PT_EI # define PT_EI __extern_always_inline #endif static __inline__ int _test_and_set (int *p, int v) { int result; __asm__ __volatile__( "/* Inline test and set */\n" " xchg %[old], %[mem], %[new]" : [old] "=&r"(result) : [mem] "r"(p), [new] "r"(v) : "memory"); return result; } extern long int testandset (int *spinlock); extern int __compare_and_swap (long int *p, long int oldval, long int newval); /* Spinlock implementation; required. */ PT_EI long int testandset (int *spinlock) { return _test_and_set(spinlock, 1); } /* Get some notion of the current stack. Need not be exactly the top of the stack, just something somewhere in the current frame. */ #define CURRENT_STACK_FRAME stack_pointer register char * stack_pointer __asm__ ("sp"); /* Compare-and-swap for semaphores. */ #define HAS_COMPARE_AND_SWAP PT_EI int __compare_and_swap(long int *p, long int oldval, long int newval) { long int result; __asm__ __volatile__( "/* Inline compare and swap */\n" "1: ssrf 5\n" " ld.w %[result], %[mem]\n" " eor %[result], %[old]\n" " brne 2f\n" " stcond %[mem], %[new]\n" " brne 1b\n" "2:" : [result] "=&r"(result), [mem] "=m"(*p) : "m"(*p), [new] "r"(newval), [old] "r"(oldval) : "cc", "memory"); return result == 0; } #endif /* pt-machine.h */ |