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_x86_darwin 10 #undef PLAT_amd64_darwin 11 #undef PLAT_x86_linux 12 #undef PLAT_amd64_linux 13 #undef PLAT_ppc32_linux 14 #undef PLAT_ppc64_linux 15 #undef PLAT_arm_linux 16 #undef PLAT_s390x_linux 17 18 #if defined(__APPLE__) && defined(__i386__) 19 # define PLAT_x86_darwin 1 20 #elif defined(__APPLE__) && defined(__x86_64__) 21 # define PLAT_amd64_darwin 1 22 #elif defined(__linux__) && defined(__i386__) 23 # define PLAT_x86_linux 1 24 #elif defined(__linux__) && defined(__x86_64__) 25 # define PLAT_amd64_linux 1 26 #elif defined(__linux__) && defined(__powerpc__) && !defined(__powerpc64__) 27 # define PLAT_ppc32_linux 1 28 #elif defined(__linux__) && defined(__powerpc__) && defined(__powerpc64__) 29 # define PLAT_ppc64_linux 1 30 #elif defined(__linux__) && defined(__arm__) 31 # define PLAT_arm_linux 1 32 #elif defined(__linux__) && defined(__s390x__) 33 # define PLAT_s390x_linux 1 34 #endif 35 36 #if defined(PLAT_amd64_linux) || defined(PLAT_x86_linux) \ 37 || defined(PLAT_amd64_darwin) || defined(PLAT_x86_darwin) 38 # define INC(_lval,_lqual) \ 39 __asm__ __volatile__ ( \ 40 "lock ; incl (%0)" : /*out*/ : /*in*/"r"(&(_lval)) : "memory", "cc" ) 41 #elif defined(PLAT_ppc32_linux) || defined(PLAT_ppc64_linux) 42 # define INC(_lval,_lqual) \ 43 __asm__ __volatile__( \ 44 "1:\n" \ 45 " lwarx 15,0,%0\n" \ 46 " addi 15,15,1\n" \ 47 " stwcx. 15,0,%0\n" \ 48 " bne- 1b\n" \ 49 : /*out*/ : /*in*/ "b"(&(_lval)) \ 50 : /*trash*/ "r15", "cr0", "memory" \ 51 ) 52 #elif defined(PLAT_arm_linux) 53 # define INC(_lval,_lqual) \ 54 __asm__ __volatile__( \ 55 "1:\n" \ 56 " ldrex r8, [%0, #0]\n" \ 57 " add r8, r8, #1\n" \ 58 " strex r9, r8, [%0, #0]\n" \ 59 " cmp r9, #0\n" \ 60 " bne 1b\n" \ 61 : /*out*/ : /*in*/ "r"(&(_lval)) \ 62 : /*trash*/ "r8", "r9", "cc", "memory" \ 63 ); 64 #elif defined(PLAT_s390x_linux) 65 # define INC(_lval,_lqual) \ 66 __asm__ __volatile__( \ 67 "1: l 0,%0\n" \ 68 " lr 1,0\n" \ 69 " ahi 1,1\n" \ 70 " cs 0,1,%0\n" \ 71 " jl 1b\n" \ 72 : "+m" (_lval) :: "cc", "1","2" \ 73 ) 74 #else 75 # error "Fix Me for this platform" 76 #endif 77 78 79 int x = 0; 80 81 void* child_fn ( void* arg ) 82 { 83 INC(x, "childfn"); 84 return NULL; 85 } 86 87 int main ( void ) 88 { 89 pthread_t child; 90 91 if (pthread_create(&child, NULL, child_fn, NULL)) { 92 perror("pthread_create"); 93 exit(1); 94 } 95 96 INC(x, "main"); 97 98 if (pthread_join(child, NULL)) { 99 perror("pthread join"); 100 exit(1); 101 } 102 103 printf("x = %d\n", x); 104 return 0; 105 } 106
