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From:	Bruno Haible <bruno AT clisp DOT org>
To:	cygwin AT cygwin DOT com
Subject:	why is pthread_key_create failing?
Date:	Tue, 6 Nov 2007 15:12:15 +0100
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Hi,

In the test program below, pthread_key_create is failing with return value
EBUSY with no good reason. The explanation in
http://www.mail-archive.com/cygwin%40cygwin.com/msg49835.html
does not apply since I'm not calling pthread_key_create on an existing
key's address, but a destroyed key's address.

$ gcc test-tls.c -o test-tls.exe
$ ./test-tls.exe
trying to get key #0
trying to get key #1
trying to get key #2
trying to get key #3
destroying key #0
destroying key #1
destroying key #2
destroying key #3
trying to get key #3
trying to get key #2
trying to get key #1
pthread_key_create -> 16
Aborting at line 31
Aborted (core dumped)

The Cygwin version that I'm using is:
$ grep VERSION /usr/include/cygwin/version.h | head -2
#define CYGWIN_VERSION_DLL_MAJOR 1005
#define CYGWIN_VERSION_DLL_MINOR 19

============================= test-tls.c ================================
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>

#define abort() (fprintf(stderr, "Aborting at line %d\n", __LINE__), abort())

#define KEYS_COUNT 4

static pthread_key_t mykeys[KEYS_COUNT];

int
main ()
{
  int i;

  for (i = 0; i < KEYS_COUNT; i++) {
    fprintf (stderr, "trying to get key #%d\n", i); fflush (stderr);
    int err = pthread_key_create (&mykeys[i], free);
    if (err != 0) { fprintf (stderr, "pthread_key_create -> %d\n", err); abort (); }
  }

  for (i = 0; i < KEYS_COUNT; i++) {
    fprintf (stderr, "destroying key #%d\n", i);
    if (pthread_key_delete (mykeys[i]) != 0) abort ();
  }

  for (i = KEYS_COUNT - 1; i >= 0; i--) {
    fprintf (stderr, "trying to get key #%d\n", i); fflush (stderr);
    int err = pthread_key_create (&mykeys[i], free);
    if (err != 0) { fprintf (stderr, "pthread_key_create -> %d\n", err); abort (); }
  }

  for (i = 0; i < KEYS_COUNT; i++) {
    fprintf (stderr, "destroying key #%d\n", i);
    if (pthread_key_delete (mykeys[i]) != 0) abort ();
  }

  return 0;
}

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