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Full Discussion: Thread parameter in ANSI C makes a segmentation fault
Top Forums Programming Thread parameter in ANSI C makes a segmentation fault Post 302519989 by Corona688 on Thursday 5th of May 2011 02:19:35 PM
Old 05-05-2011
Quote:
Originally Posted by sehang
Thanks, I will use fprintf to catch the pointer value.

Before I post the problem on the forum, I tried to use
Code:
 void *value=(void *)42;
  int ivalue=(int)(value);

But the problem still happened.
Then the problem has nothing to do with that line.
Quote:
I have another idea, is it the problem cause by different compile options?
Code:
 gcc -O3 *.c

Code:
  gcc *.c

-O3 by itself doesn't cause it to crash. However it can expose latent bugs in your program.
Quote:
Besides, I used outl(...), iopl(...) to control SPI. Are they also affect this threading?
This is an extremely poor design and I can't guarantee anything about it. Given the way modern systems work I can't even guarantee you're actually talking to I/O ports. Is it possible to use an actual device driver instead?
 

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LEARN ABOUT FREEBSD

pthread_resume_np

PTHREAD_RESUME_NP(3)					   BSD Library Functions Manual 				      PTHREAD_RESUME_NP(3)

NAME

     pthread_resume_np -- resume suspended thread

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread_np.h>

     int
     pthread_resume_np(pthread_t tid);

DESCRIPTION

     The pthread_resume_np() function, called on a suspended thread, causes it to resume.  If a thread specified by the tid argument is not sus-
     pended, no actions will be performed.

RETURN VALUES

     If successful, pthread_resume_np() function returns 0.  Otherwise, an error number is returned to indicate the error.

ERRORS

     The pthread_resume_np() function will fail if:

     [EINVAL]		The value specified by the tid argument is invalid.

     [ESRC]		No thread could be found corresponding to the thread ID specified by the tid argument.

SEE ALSO

     pthread_attr_setcreatesuspend_np(3), pthread_resume_all_np(3), pthread_suspend_all_np(3), pthread_suspend_np(3)

AUTHORS

     This manual page was written by Alexey Zelkin <phantom@FreeBSD.org>.

BSD
								 February 13, 2003							       BSD
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