Revert the thread exit race fix for now, it doesn't work right on
[wine] / loader / pthread.c
1 /*
2  * Wine threading routines using the pthread library
3  *
4  * Copyright 2003 Alexandre Julliard
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #ifdef HAVE_PTHREAD_H
25
26 #include <assert.h>
27 #include <stdlib.h>
28 #include <signal.h>
29 #ifdef HAVE_UNISTD_H
30 # include <unistd.h>
31 #endif
32 #include <string.h>
33 #include <sys/types.h>
34 #ifdef HAVE_SYS_MMAN_H
35 #include <sys/mman.h>
36 #endif
37
38 #include "wine/library.h"
39 #include "wine/pthread.h"
40
41 static struct wine_pthread_functions funcs;
42
43 #ifndef __i386__
44 static pthread_key_t teb_key;
45 #endif
46
47 /***********************************************************************
48  *           wine_pthread_init_process
49  *
50  * Initialization for a newly created process.
51  */
52 void wine_pthread_init_process( const struct wine_pthread_functions *functions )
53 {
54     memcpy( &funcs, functions, min(functions->size,sizeof(funcs)) );
55 }
56
57
58 /***********************************************************************
59  *           wine_pthread_init_thread
60  *
61  * Initialization for a newly created thread.
62  */
63 void wine_pthread_init_thread( struct wine_pthread_thread_info *info )
64 {
65     /* retrieve the stack info (except for main thread) */
66     if (funcs.ptr_set_thread_data)
67     {
68 #ifdef HAVE_PTHREAD_GETATTR_NP
69         pthread_attr_t attr;
70         pthread_getattr_np( pthread_self(), &attr );
71         pthread_attr_getstack( &attr, &info->stack_base, &info->stack_size );
72 #else
73         /* assume that the stack allocation is page aligned */
74         char dummy;
75         size_t page_mask = getpagesize() - 1;
76         char *stack_top = (char *)((unsigned long)(&dummy + page_mask) & ~page_mask);
77         info->stack_base = stack_top - info->stack_size;
78 #endif
79     }
80 }
81
82
83 /***********************************************************************
84  *           wine_pthread_create_thread
85  */
86 int wine_pthread_create_thread( struct wine_pthread_thread_info *info )
87 {
88     pthread_t id;
89     pthread_attr_t attr;
90     int ret = 0;
91
92     pthread_attr_init( &attr );
93     pthread_attr_setstacksize( &attr, info->stack_size );
94     if (pthread_create( &id, &attr, (void * (*)(void *))info->entry, info )) ret = -1;
95     pthread_attr_destroy( &attr );
96     return ret;
97 }
98
99
100 /***********************************************************************
101  *           wine_pthread_init_current_teb
102  *
103  * Set the current TEB for a new thread.
104  */
105 void wine_pthread_init_current_teb( struct wine_pthread_thread_info *info )
106 {
107 #ifdef __i386__
108     /* On the i386, the current thread is in the %fs register */
109     LDT_ENTRY fs_entry;
110
111     wine_ldt_set_base( &fs_entry, info->teb_base );
112     wine_ldt_set_limit( &fs_entry, info->teb_size - 1 );
113     wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
114     wine_ldt_init_fs( info->teb_sel, &fs_entry );
115 #else
116     if (!funcs.ptr_set_thread_data)  /* first thread */
117         pthread_key_create( &teb_key, NULL );
118     pthread_setspecific( teb_key, info->teb_base );
119 #endif
120
121     /* set pid and tid */
122     info->pid = getpid();
123     info->tid = gettid();
124 }
125
126
127 /***********************************************************************
128  *           wine_pthread_get_current_teb
129  */
130 void *wine_pthread_get_current_teb(void)
131 {
132 #ifdef __i386__
133     void *ret;
134     __asm__( ".byte 0x64\n\tmovl 0x18,%0" : "=r" (ret) );
135     return ret;
136 #else
137     return pthread_getspecific( teb_key );
138 #endif
139 }
140
141
142 /***********************************************************************
143  *           wine_pthread_exit_thread
144  */
145 void wine_pthread_exit_thread( struct wine_pthread_thread_info *info )
146 {
147     struct cleanup_info
148     {
149         pthread_t self;
150         struct wine_pthread_thread_info thread_info;
151     };
152
153     static struct cleanup_info *previous_info;
154     struct cleanup_info *cleanup_info, *free_info;
155     void *ptr;
156
157     /* store it at the end of the TEB structure */
158     cleanup_info = (struct cleanup_info *)((char *)info->teb_base + info->teb_size) - 1;
159     cleanup_info->self = pthread_self();
160     cleanup_info->thread_info = *info;
161
162     if ((free_info = interlocked_xchg_ptr( (void **)&previous_info, cleanup_info )) != NULL)
163     {
164         pthread_join( free_info->self, &ptr );
165         wine_ldt_free_fs( free_info->thread_info.teb_sel );
166         munmap( free_info->thread_info.teb_base, free_info->thread_info.teb_size );
167     }
168     pthread_exit( (void *)info->exit_status );
169 }
170
171
172 /***********************************************************************
173  *           wine_pthread_abort_thread
174  */
175 void wine_pthread_abort_thread( int status )
176 {
177     pthread_detach( pthread_self() );  /* no one will be joining with us */
178     pthread_exit( (void *)status );
179 }
180
181 #endif  /* HAVE_PTHREAD_H */