1 files changed, 144 insertions, 0 deletions
diff --git a/mysys/my_os2tls.c b/mysys/my_os2tls.c
new file mode 100644
index 00000000000..25d543d0768
--- /dev/null
+++ b/mysys/my_os2tls.c
@@ -0,0 +1,144 @@
+/* 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; either
+   version 2 of the License, or (at your option) any later version.
+
+   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;
+}