修改multithreading的PIDpipe理器_语言综合

概述修改multithreading的PIDpipe理器

以下是我的PID经理。我想修改它，所以它使用multithreading。因此，我想为每个线程请求一个PID（也许创build20左右像我在做while循环），睡一段随机时间（我假设使用睡眠（）），然后释放PID（类似于你在下面看到）。

当谈到C和linux中的线程时，我是个新手，所以如果有人可以帮我修改这个。我会从clone（）函数调用开始吗？

#include <stdio.h> #include <stdlib.h> #include <limits.h> #define MIN_PID 300 #define MAX_PID 5000 #define CB CHAR_BIT int sz = MAX_PID - MIN_PID + 1; unsigned char *unsignedChar; int allocate_map(); int allocate_pID(); voID release_pID(int pID); int main() { int map = allocate_map(); if (map == 1) { printf("nBitmap Data Structure initialized.n"); int ID = 0,i = 0; //create 20 processes while (i < 20) { int val = allocate_pID(); printf("nProcess %d: pID = %d",i+1,val); i++; } //release a few processes release_pID(303); printf("nProcess 303 released."); release_pID(308); printf("nProcess 308 released."); release_pID(309); printf("nProcess 309 released."); //allocate a few more processes after this release int val = allocate_pID(); printf("nProcess %d : pID = %d",++i,val); //should be 303 val = allocate_pID(); printf("nProcess %d : pID = %dn",val); //should be 308 } else printf("nFailed to initialize data structure.n"); } /* Creates and initializes a bitmap data structure for representing pIDs; returns —1 for unsuccessful,1 for successful */ int allocate_map() { unsignedChar = (unsigned char*)malloc((sz+CB-1)/CB * sizeof(char)); if (unsignedChar) return 1; return -1; } /* Allocates and returns a pID; returns -1 if it is unable to allocate a pID (all pIDs are in use) */ int allocate_pID() { int i = 0; int pID = unsignedChar[i/CB] & (1 << (i & (CB-1))); while (pID != 0) { i++; pID = unsignedChar[i/CB] & (1 << (i & (CB-1))); } if (i+MIN_PID > MAX_PID) return -1; unsignedChar[i/CB] |= 1 << (i & (CB-1)); return i+MIN_PID; } /* Releases a pID given a pID parameter*/ voID release_pID(int pID) { if (pID < 300) { printf("nInvalID PID: It should lIE between 300 and 3000."); return; } int i = pID - MIN_PID; unsignedChar[i/CB] &= ~(1 << (i & (CB-1))); }

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Posix线程是最简单和规范的方式来做到这一点。

维基百科已经有了一个很好的例子。