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/* Copyright (C) Yuri Dario & 2000 MySQL AB
All the above parties has a full, independent copyright to
the following code, including the right to use the code in
any manner without any demands from the other parties.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; version 2
of the License.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
DWORD TlsAlloc( void);
BOOL TlsFree( DWORD);
PVOID TlsGetValue( DWORD);
BOOL TlsSetValue( DWORD, PVOID);
#define TLS_MINIMUM_AVAILABLE 64
PULONG tls_storage; /* TLS local storage */
DWORD tls_bits[2]; /* TLS in-use bits */
pthread_mutex_t tls_mutex; /* TLS mutex for in-use bits */
DWORD TlsAlloc( void)
{
DWORD index = -1;
DWORD mask, tibidx;
int i;
if (tls_storage == NULL)
{
APIRET rc;
/* allocate memory for TLS storage */
rc = DosAllocThreadLocalMemory( 1, &tls_storage);
if (rc)
fprintf( stderr, "DosAllocThreadLocalMemory error: return code = %u\n",
rc);
/* create a mutex */
if (pthread_mutex_init( &tls_mutex, NULL))
fprintf( stderr, "Failed to init TLS mutex\n");
}
pthread_mutex_lock( &tls_mutex);
tibidx = 0;
if (tls_bits[0] == 0xFFFFFFFF)
{
if (tls_bits[1] == 0xFFFFFFFF)
{
fprintf( stderr, "tid#%d, no more TLS bits available\n", _threadid);
pthread_mutex_unlock( &tls_mutex);
return -1;
}
tibidx = 1;
}
for (i=0; i<32; i++)
{
mask = (1 << i);
if ((tls_bits[ tibidx] & mask) == 0)
{
tls_bits[ tibidx] |= mask;
index = (tibidx*32) + i;
break;
}
}
tls_storage[index] = 0;
pthread_mutex_unlock( &tls_mutex);
/* fprintf( stderr, "tid#%d, TlsAlloc index %d\n", _threadid, index); */
return index;
}
BOOL TlsFree( DWORD index)
{
int tlsidx;
DWORD mask;
if (index >= TLS_MINIMUM_AVAILABLE)
return NULL;
pthread_mutex_lock( &tls_mutex);
tlsidx = 0;
if (index > 32)
tlsidx++;
mask = (1 << index);
if (tls_bits[ tlsidx] & mask)
{
tls_bits[tlsidx] &= ~mask;
tls_storage[index] = 0;
pthread_mutex_unlock( &tls_mutex);
return TRUE;
}
pthread_mutex_unlock( &tls_mutex);
return FALSE;
}
PVOID TlsGetValue( DWORD index)
{
if (index >= TLS_MINIMUM_AVAILABLE)
return NULL;
/* verify if memory has been allocated for this thread */
if (*tls_storage == NULL)
{
/* allocate memory for indexes */
*tls_storage = (ULONG)calloc( TLS_MINIMUM_AVAILABLE, sizeof(int));
/* fprintf(stderr, "tid#%d, tls_storage %x\n", _threadid, *tls_storage); */
}
ULONG* tls_array = (ULONG*) *tls_storage;
return (PVOID) tls_array[index];
}
BOOL TlsSetValue( DWORD index, PVOID val)
{
/* verify if memory has been allocated for this thread */
if (*tls_storage == NULL)
{
/* allocate memory for indexes */
*tls_storage = (ULONG)calloc( TLS_MINIMUM_AVAILABLE, sizeof(int));
/* fprintf(stderr, "tid#%d, tls_storage %x\n", _threadid, *tls_storage); */
}
if (index >= TLS_MINIMUM_AVAILABLE)
return FALSE;
ULONG* tls_array = (ULONG*) *tls_storage;
/* fprintf( stderr, "tid#%d, TlsSetValue array %08x index %d -> %08x (old)\n", _threadid, tls_array, index, tls_array[ index]); */
tls_array[ index] = (ULONG) val;
/* fprintf( stderr, "tid#%d, TlsSetValue array %08x index %d -> %08x\n", _threadid, tls_array, index, val); */
return TRUE;
}
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