[B! pthread] Trapezoidã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

Trapezoid id:Trapezoid

pthreadã«é–¢ã™ã‚‹Trapezoidã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (4)

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é©å‘½ã®æ—¥ã€…ï¼ ãªã‚“ã§ã€pthread_once()ãªã‚“ã¦å˜åœ¨ã™ã‚‹ã®ï¼Ÿ
http://d.hatena.ne.jp/amachang/20080612/1213244820 ãŠæ°—ã«å…¥ã‚Šãªã‚µã‚¤ãƒˆã®ITæˆ¦è¨˜ã‚ˆã‚Š // ã“ã“ã‚’ volatile ã«ã™ã‚‹ // ï¼ˆã“ã®å¤‰æ•°ã®å€¤ã¯ã‚¢ãƒˆãƒŸãƒƒã‚¯ï¼ˆã¤ã¾ã‚Šã€ãƒ¬ã‚¸ã‚¹ã‚¿ã«ã ã‘ã‚ã£ã¦ãƒ¡ãƒ¢ãƒªã«ãªã„ã¨ã„ã†ã“ã¨ãŒãªã„å¤‰æ•°ã«ï¼‰ã«ãªã‚‹ï¼‰ volatile char* p = NULL; pthread_mutex_t m; void* f(void* _p) { // ãƒãƒƒã‚¯ã‹ã‹ã‚‰ãªã„ if (p == NULL) { pthread_mutex_lock(&m); // ã“ã“ã‹ã‚‰ã¯ã‚¯ãƒªãƒ†ã‚£ã‚«ãƒ«ã‚»ã‚¯ã‚·ãƒ§ãƒ³ // ä¸€å€‹ç›®ã®åˆæœŸåŒ–æ™‚ã«ã“ã“ã§ãƒ–ãƒãƒƒã‚¯ã—ãŸã‚¹ãƒ¬ãƒƒãƒ‰ã®ãŸã‚ã« // ã‚‚ã†ä¸€å›ž NULL ãƒã‚§ãƒƒã‚¯ if (p == NULL) { // ã“ã“ã§ã¯ã¾ã p ã«ä»£å…¥ã—ãªã„ // ä»£å…¥ã—ãŸã‚‰åˆ¥ã‚¹ãƒ¬ãƒƒãƒ‰ã§åˆæœŸåŒ–ã•ã‚Œã¦ã„ãªã„ p ãŒè¿”ã£ã¦ã—ã¾ã† cha
Trapezoid 2008/06/17
pthread

c
ãƒªãƒ³ã‚¯
æœ€åˆã®ä¸€å›žã ã‘åˆæœŸåŒ–ã—ãŸã„ã¨ã - ITæˆ¦è¨˜
ä¸€æ—¥ä¸€å›žã‚¹ãƒ¬ãƒƒãƒ‰å‹‰å¼· æœ€åˆã®ä¸€å›žã ã‘åˆæœŸåŒ–ã—ãŸã„ã¨ã ä»¥ä¸‹ã®ã‚ˆã†ã«æ›¸ã // ã¾ã£ãŸãã‚»ãƒ³ã‚¹ã®ãªã„ä¾‹ã§ã™ãŒ #include <stdio.h> #include <pthread.h> // ã“ã® p ã‚’ static char* p = NULL; static pthread_mutex_t m; void* f(void* _p) { // æœ€åˆã«ã“ã“ã‚’é€šã£ãŸã¨ãã ã‘åˆæœŸåŒ–ã—ãŸã„ pthread_mutex_lock(&m); if (p == NULL) { char* tmp = (char*)malloc(10); strcpy(tmp, "hoge"); p = tmp; } pthread_mutex_unlock(&m); *(char**)_p = p; } int main() { pthread_t t0, t1; char* p0; char* p1; pthr
Trapezoid 2008/06/12
pthread

thread
ãƒªãƒ³ã‚¯
pthread ã§ã‚ãƒ¥ãƒ¼ã‚’æ›¸ã„ã¦ã¿ã‚‹ - ITæˆ¦è¨˜
ã“ã®è¨˜äº‹ã¯å…¨ç„¶ãƒ€ãƒ¡ã ã£ãŸã‚ˆã†ã§ã™ã€‚ ã“ã¡ã‚‰ã«æ–°ã—ãæ›¸ãç›´ã—ã¾ã—ãŸã€‚ http://d.hatena.ne.jp/amachang/20080617/1213694238 ã“ã‚“ãªæ„Ÿã˜ã«ãªã£ãŸ #include <stdio.h> #include <stdlib.h> #include <memory.h> #include <pthread.h> static int* q; static int n; // æ¬¡ã«å…¥ã‚Œã‚‹ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ static int l; // æ¬¡ã«å‡ºã™ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ static int s; static pthread_mutex_t m; static pthread_cond_t c; void initQ (size_t size) { n = 0; l = 0; s = size; // ã‚ãƒ¥ãƒ¼ã®é ˜åŸŸç¢ºä¿ q = (int*)malloc(s * size
Trapezoid 2008/06/11
thread

pthread

mutex

unix

algorithm
ãƒªãƒ³ã‚¯
pthread å‹‰å¼· - ITæˆ¦è¨˜
ã ã‚‰ã ã‚‰æ›¸ãã‚ˆ åˆã‚ã¦ã®ã‚³ãƒ¼ãƒ‰ #include <pthread.h> void* f(void* p) { puts("hello"); sleep(1); puts("hello"); sleep(1); puts("hello"); } int main(int argc, char** argv) { pthread_t thread; pthread_create(&thread, NULL, f, (void*)NULL); pthread_join(thread, NULL); } $ gcc p.c -lpthread && ./a.out hello hello hello $ãŠãŠãŠã€‚ã‚¹ãƒ¬ãƒƒãƒ‰ã‚¹ãƒ¬ãƒƒãƒ‰ ã¿ã‚…ãƒ¼ã¦ã£ãã¤ #include <pthread.h> // ã¿ã‚…ãƒ¼ã¦ã£ãã¤ pthread_mutex_t m; void* f(void* p) { int i;
Trapezoid 2008/06/11
thread

pthread

mutex

unix
ãƒªãƒ³ã‚¯
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