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PO"invalid conversion from" with pthread_create issue
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copied!<p>Any comment is appreciated for the compile error below. Although my question is similar to other thread: <a href="https://stackoverflow.com/questions/1151582/pthread-function-from-a-class">pthread function from a class</a>, I still haven't been able to solve my problem. I am still not that familliar with pointer, and thread programming in C & C++.</p> <p>Error</p> <pre><code>../src/Main.cpp: In function ‘int main(int, char**)’: ../src/Main.cpp:22: error: invalid conversion from ‘unsigned int* (*)(void*)’ to ‘void* (*)(void*)’ ../src/Main.cpp:22: error: initializing argument 3 of ‘int pthread_create(pthread_t*, const pthread_attr_t*, void* (*)(void*), void*)’ make: *** [src/Main.o] Error 1 </code></pre> <p>Main.cpp</p> <pre><code>#include <process.h> #include "ThreadInstance.hpp" #include <iostream> #include <fstream> using namespace std; int main(int argc, char** argv) { pthread_mutex_t mutex; int ht1; pthread_t threadId1; pthread_attr_t attr1; pthread_mutex_init(&mutex, NULL); pthread_attr_init(&attr1); pthread_attr_setdetachstate(&attr1, PTHREAD_CREATE_DETACHED); ht1 = pthread_create(&threadId1, &attr1, &ThreadInstance::ThreadEntryPoint, //(void *)readThread); NULL); unsigned long rc = 0; rc = pthread_join(ht1, NULL); return 0; } </code></pre> <p>ThreadInstance.hpp</p> <pre><code>#ifndef _SCENE_CLASSIFY_THREAD_H #define _SCENE_CLASSIFY_THREAD_H #ifndef STDCALL #define STDCALL __attribute__((stdcall)) #endif using namespace std; class ThreadInstance { public: ThreadInstance(); ThreadInstance(int camNum); void startUp(); static unsigned STDCALL* ThreadEntryPoint(void* pThis) { //static unsigned __stdcall ThreadEntryPoint(void* pThis) { ThreadInstance *ptr = (ThreadInstance*) pThis; ptr->startUp(); //return 1; // Returns error "invalid conversion from ‘int’ to ‘unsigned int*’" when the function is declared as pointer. // Since returning either 1 or 0, // compile error still occurs. // So this return value should not be the cause. return 0; } ~ThreadInstance(); }; #endif </code></pre> <p>Note: Only necessary part is shown</p>

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