Well,
Now that you say that. I will simplify my makefile, but then it doesn't know
what pthread_create is.. or anything related to pthread.
C:\Users\Viper\Documents\Cpp\Pthreads>"C:\Program Files\SlickEdit
2009\win\vsbuild" -signal 9009 -command make -f "Makefile" CFG=Debug
VSLICKERRORPATH="C:\Users\Viper\Documents\Cpp\Pthreads"
make -f Makefile CFG=Debug
g++ -c -g -o "Debug/Pthreads.o" Pthreads.cpp
Pthreads.cpp:10:21: pthread.h: No such file or directory
Pthreads.cpp: In function `void* PrintHello(void*)':
Pthreads.cpp:22: error: `pthread_exit' undeclared (first use this function)
Pthreads.cpp:22: error: (Each undeclared identifier is reported only once
for each function it appears in.)
Pthreads.cpp: In function `int main(int, char**)':
Pthreads.cpp:27: error: `pthread_t' undeclared (first use this function)
Pthreads.cpp:27: error: expected `;' before "threads"
Pthreads.cpp:32: error: `threads' undeclared (first use this function)
Pthreads.cpp:32: error: `pthread_create' undeclared (first use this
function)
Pthreads.cpp:39: error: `pthread_exit' undeclared (first use this function)
mingw32-make: *** [Debug/Pthreads.o] Error 1
The Pthreads.cpp file is perfect, I've tried it in Linux..
/*****************************************************************************
* FILE: hello_arg3.c
* DESCRIPTION:
* This "hello world" Pthreads program demonstrates an unsafe (incorrect)
* way to pass thread arguments at thread creation. In this case, the
* argument variable is changed by the main thread as it creates new
threads.
* AUTHOR: Blaise Barney
* LAST REVISED: 01/30/09
******************************************************************************/
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#define NUM_THREADS 8
void *PrintHello(void *threadid)
{
long taskid;
printf("threadid=0x%x\n", threadid);
// sleep(1);
taskid = (long) threadid;
printf("Hello from thread %ld\n", taskid);
pthread_exit(NULL);
}
int main(int argc, char *argv[])
{
pthread_t threads[NUM_THREADS];
int rc;
long t;
for ( t=0;t<NUM_THREADS;t++ ) {
printf("Creating thread %ld\n", t);
rc = pthread_create(&threads[t], NULL, PrintHello, (void *) t);
if ( rc ) {
printf("ERROR; return code from pthread_create() is %d\n", rc);
exit(-1);
}
}
pthread_exit(NULL);
}
Dave Korn-6 wrote:
>
> Afflictedd2 wrote:
>
>> I'm trying to build a simple program using pthreads, but I get the
>> following
>> errors, why?
>
>> g++ -c -g -o "Debug/Pthreads.o" -I/Cygwin/usr/include Pthreads.cpp
> ^^^^^^^^^^^^^^^^^^^^^^
>
> Don't do that, for a start. The compiler knows about all the system's
> default include directories already, and has them in a carefully-placed
> search
> order. If you're lucky, it will just ignore that -I option; if you're
> unlucky
> it might be messing things up.
>
> If that doesn't fix it you'll need to try and show us a small simple
> testcase; sounds like whatever it is, we'd just need the first ten lines
> of
> your Pthreads.cpp file (up to the #include that prompts the first errors)
> in
> order to try and reproduce it.
>
> cheers,
> DaveK
>
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