Bug#505784: pthread_cancel(3): misleading information on cancellation points

[Jakub Wilk <ubanus@users.sf.net>]

Package: glibc-doc
Version: 2.7-15
Severity: normal
File: /usr/share/man/man3/pthread_cancel.3.gz

"""
POSIX specifies that a number of system calls (basically, all system 
calls that may block, such as read(2), write(2), wait(2), etc.) and 
library functions that may call these system calls (e.g.  fprintf(3)) 
are cancellation points. LinuxThreads is not yet integrated enough with 
the C library to implement this, and thus none of the C library 
functions is a cancellation point.
"""

This is no longer true, as you can easily check with the attached 
program.

--
Jakub Wilk

#include <stdio.h>
#include <pthread.h>
#include <unistd.h>

volatile int i;

void *start(void *p)
{
  i = 0;
  while (1)
  {
    putchar('.');
    i++;
  }
  return NULL;
}

int main()
{
  pthread_t thread;
  pthread_create(&thread, NULL, start, NULL);
  usleep(1 << 15);
  pthread_cancel(thread);
  pthread_join(thread, NULL);
  printf("\n%d\n", i);
  return 0;
}

/* vim:set ts=2 sw=2 et:*/