1 2 #include <pthread.h> 3 #include <stdio.h> 4 #include <stdlib.h> 5 6 /* Simple test program, no race. Parent and child both modify x and 7 use the hardware bus lock. */ 8 9 #undef PLAT_ppc64_aix5 10 #undef PLAT_ppc32_aix5 11 #undef PLAT_x86_darwin 12 #undef PLAT_amd64_darwin 13 #undef PLAT_x86_linux 14 #undef PLAT_amd64_linux 15 #undef PLAT_ppc32_linux 16 #undef PLAT_ppc64_linux 17 #undef PLAT_arm_linux 18 19 #if defined(_AIX) && defined(__64BIT__) 20 # define PLAT_ppc64_aix5 1 21 #elif defined(_AIX) && !defined(__64BIT__) 22 # define PLAT_ppc32_aix5 1 23 #elif defined(__APPLE__) && defined(__i386__) 24 # define PLAT_x86_darwin 1 25 #elif defined(__APPLE__) && defined(__x86_64__) 26 # define PLAT_amd64_darwin 1 27 #elif defined(__linux__) && defined(__i386__) 28 # define PLAT_x86_linux 1 29 #elif defined(__linux__) && defined(__x86_64__) 30 # define PLAT_amd64_linux 1 31 #elif defined(__linux__) && defined(__powerpc__) && !defined(__powerpc64__) 32 # define PLAT_ppc32_linux 1 33 #elif defined(__linux__) && defined(__powerpc__) && defined(__powerpc64__) 34 # define PLAT_ppc64_linux 1 35 #elif defined(__linux__) && defined(__arm__) 36 # define PLAT_arm_linux 1 37 #endif 38 39 #if defined(PLAT_amd64_linux) || defined(PLAT_x86_linux) \ 40 || defined(PLAT_amd64_darwin) || defined(PLAT_x86_darwin) 41 # define INC(_lval,_lqual) \ 42 __asm__ __volatile__ ( \ 43 "lock ; incl (%0)" : /*out*/ : /*in*/"r"(&(_lval)) : "memory", "cc" ) 44 #elif defined(PLAT_ppc32_linux) || defined(PLAT_ppc64_linux) \ 45 || defined(PLAT_ppc32_aix5) || defined(PLAT_ppc64_aix5) 46 # define INC(_lval,_lqual) \ 47 __asm__ __volatile__( \ 48 "L1xyzzy1" _lqual ":\n" \ 49 " lwarx 15,0,%0\n" \ 50 " addi 15,15,1\n" \ 51 " stwcx. 15,0,%0\n" \ 52 " bne- L1xyzzy1" _lqual \ 53 : /*out*/ : /*in*/ "b"(&(_lval)) \ 54 : /*trash*/ "r15", "cr0", "memory" \ 55 ) 56 #elif defined(PLAT_arm_linux) 57 # define INC(_lval,_lqual) \ 58 __asm__ __volatile__( \ 59 "L1xyzzy1" _lqual ":\n" \ 60 " ldrex r8, [%0, #0]\n" \ 61 " add r8, r8, #1\n" \ 62 " strex r9, r8, [%0, #0]\n" \ 63 " cmp r9, #0\n" \ 64 " bne L1xyzzy1" _lqual \ 65 : /*out*/ : /*in*/ "r"(&(_lval)) \ 66 : /*trash*/ "r8", "r9", "cc", "memory" \ 67 ); 68 #else 69 # error "Fix Me for this platform" 70 #endif 71 72 73 int x = 0; 74 75 void* child_fn ( void* arg ) 76 { 77 INC(x, "childfn"); 78 return NULL; 79 } 80 81 int main ( void ) 82 { 83 pthread_t child; 84 85 if (pthread_create(&child, NULL, child_fn, NULL)) { 86 perror("pthread_create"); 87 exit(1); 88 } 89 90 INC(x, "main"); 91 92 if (pthread_join(child, NULL)) { 93 perror("pthread join"); 94 exit(1); 95 } 96 97 printf("x = %d\n", x); 98 return 0; 99 } 100
