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POAccessing global variables in pthreads in different c-files
 

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    <p>I have a main.c with a global variable called <code>int countboards</code>. In the main() I start a pthread, that listens to ONE TCP-Connection and runs that through (progserver.c). Means, this thread will never return. In the main() I enter the function <code>rmmain(...)</code> which is in the rm.c (RM=Ressource Manager). In rm.c I read <code>countboards</code>, in the progserver.c in the pthread I write to this variable (both are made accessible by <code>extern int countboards</code>).</p> <p>So the problem is, when I write to <code>countboards</code> in the pthread and I want to access this variable after it's been written to in the rm.c, it still has the old value (in this case 0 instead of for example 10). Why?</p> <p>main.c:</p> <pre><code>int countboards; int main(int argc, char** argv) { countboards = 0; pthread_t thread; pthread_create(&amp;thread, NULL, startProgramserver, NULL); rmmain(); return 0; } </code></pre> <p>rm.c:</p> <pre><code>extern int countboards; int rmmain(vhbuser* vhbuserlist, int countvhbuser, userio* useriolist, int countios, int usertorm, int rmtosslserver, int sslservertorm) { while(1) { int n; n=read(usertorm,buf,bufc); // blocks until command comes from the user ... board* b = findAFreeBoard(boardlist, countboards, usagelist); // here countboards should be &gt;0, but it isn't ... } } </code></pre> <p>programserver.c:</p> <pre><code>extern int countboards; void* startProgramserver(void*) { ... sock = tcp_listen(); ... http_serve(ssl,s, sslpipes); } static int http_serve(SSL *ssl, int s, void* sslpipes) { ... countboards = countboards + countboardscommands; ... // here countboards has the new value } </code></pre>
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