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#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
/* Simple test program, no race. Parent and child both modify x and
use the hardware bus lock. */
#undef PLAT_x86_darwin
#undef PLAT_amd64_darwin
#undef PLAT_x86_linux
#undef PLAT_amd64_linux
#undef PLAT_ppc32_linux
#undef PLAT_ppc64_linux
#undef PLAT_arm_linux
#undef PLAT_arm64_linux
#undef PLAT_s390x_linux
#undef PLAT_mips32_linux
#undef PLAT_tilegx_linux
#undef PLAT_x86_solaris
#undef PLAT_amd64_solaris
#if defined(__APPLE__) && defined(__i386__)
# define PLAT_x86_darwin 1
#elif defined(__APPLE__) && defined(__x86_64__)
# define PLAT_amd64_darwin 1
#elif defined(__linux__) && defined(__i386__)
# define PLAT_x86_linux 1
#elif defined(__linux__) && defined(__x86_64__)
# define PLAT_amd64_linux 1
#elif defined(__linux__) && defined(__powerpc__) && !defined(__powerpc64__)
# define PLAT_ppc32_linux 1
#elif defined(__linux__) && defined(__powerpc__) && defined(__powerpc64__)
# define PLAT_ppc64_linux 1
#elif defined(__linux__) && defined(__arm__) && !defined(__aarch64__)
# define PLAT_arm_linux 1
#elif defined(__linux__) && defined(__aarch64__) && !defined(__arm__)
# define PLAT_arm64_linux 1
#elif defined(__linux__) && defined(__s390x__)
# define PLAT_s390x_linux 1
#elif defined(__linux__) && defined(__mips__)
# define PLAT_mips32_linux 1
#elif defined(__linux__) && defined(__tilegx__)
# define PLAT_tilegx_linux 1
#elif defined(__sun__) && defined(__i386__)
# define PLAT_x86_solaris 1
#elif defined(__sun__) && defined(__x86_64__)
# define PLAT_amd64_solaris 1
#endif
#if defined(PLAT_amd64_linux) || defined(PLAT_x86_linux) \
|| defined(PLAT_amd64_darwin) || defined(PLAT_x86_darwin) \
|| defined(PLAT_amd64_solaris) || defined(PLAT_x86_solaris)
# define INC(_lval,_lqual) \
__asm__ __volatile__ ( \
"lock ; incl (%0)" : /*out*/ : /*in*/"r"(&(_lval)) : "memory", "cc" )
#elif defined(PLAT_ppc32_linux) || defined(PLAT_ppc64_linux)
# define INC(_lval,_lqual) \
__asm__ __volatile__( \
"1:\n" \
" lwarx 15,0,%0\n" \
" addi 15,15,1\n" \
" stwcx. 15,0,%0\n" \
" bne- 1b\n" \
: /*out*/ : /*in*/ "b"(&(_lval)) \
: /*trash*/ "r15", "cr0", "memory" \
)
#elif defined(PLAT_arm_linux)
# define INC(_lval,_lqual) \
__asm__ __volatile__( \
"1:\n" \
" ldrex r8, [%0, #0]\n" \
" add r8, r8, #1\n" \
" strex r9, r8, [%0, #0]\n" \
" cmp r9, #0\n" \
" bne 1b\n" \
: /*out*/ : /*in*/ "r"(&(_lval)) \
: /*trash*/ "r8", "r9", "cc", "memory" \
);
#elif defined(PLAT_arm64_linux)
# define INC(_lval,_lqual) \
__asm__ __volatile__( \
"1:\n" \
" ldxr w8, [%0, #0]\n" \
" add w8, w8, #1\n" \
" stxr w9, w8, [%0, #0]\n" \
" cmp w9, #0\n" \
" bne 1b\n" \
: /*out*/ : /*in*/ "r"(&(_lval)) \
: /*trash*/ "x8", "x9", "cc", "memory" \
);
#elif defined(PLAT_s390x_linux)
# define INC(_lval,_lqual) \
__asm__ __volatile__( \
"1: l 0,%0\n" \
" lr 1,0\n" \
" ahi 1,1\n" \
" cs 0,1,%0\n" \
" jl 1b\n" \
: "+m" (_lval) :: "cc", "1","2" \
)
#elif defined(PLAT_mips32_linux)
# define INC(_lval,_lqual) \
__asm__ __volatile__ ( \
"1:\n" \
" move $8, %0\n" \
" ll $9, 0($8)\n" \
" addiu $9, $9, 1\n" \
" sc $9, 0($8)\n" \
" li $10, 1\n" \
" bne $9, $10, 1b\n" \
" nop\n" \
: /*out*/ : /*in*/ "r"(&(_lval)) \
: /*trash*/ "$8", "$9", "$10", "cc", "memory" \
)
#elif defined(PLAT_tilegx_linux)
# define INC(_lval,_lqual) \
if (sizeof(_lval) == 4) \
__insn_fetchadd(&(_lval), 1); \
else if(sizeof(_lval) == 8) \
__insn_fetchadd(&(_lval), 1)
#else
# error "Fix Me for this platform"
#endif
int x = 0;
void* child_fn ( void* arg )
{
INC(x, "childfn");
return NULL;
}
int main ( void )
{
pthread_t child;
if (pthread_create(&child, NULL, child_fn, NULL)) {
perror("pthread_create");
exit(1);
}
INC(x, "main");
if (pthread_join(child, NULL)) {
perror("pthread join");
exit(1);
}
printf("x = %d\n", x);
return 0;
}
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