1 /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
27 #include <sys/types.h>
28 #include <hp-timing.h>
30 #ifdef __need_struct_pthread_size
31 #define lll_lock_t int
33 #include <lowlevellock.h>
34 #include <pthreaddef.h>
35 #include <dl-sysdep.h>
37 #include "../nptl_db/thread_db.h"
39 #ifdef HAVE_FORCED_UNWIND
42 #define __need_res_state
46 # define TCB_ALIGNMENT sizeof (double)
50 /* We keep thread specific data in a special data structure, a two-level
51 array. The top-level array contains pointers to dynamically allocated
52 arrays of a certain number of data pointers. So we can implement a
53 sparse array. Each dynamic second-level array has
54 PTHREAD_KEY_2NDLEVEL_SIZE
55 entries. This value shouldn't be too large. */
56 #define PTHREAD_KEY_2NDLEVEL_SIZE 32
58 /* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE
59 keys in each subarray. */
60 #define PTHREAD_KEY_1STLEVEL_SIZE \
61 ((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \
62 / PTHREAD_KEY_2NDLEVEL_SIZE)
67 /* Internal version of the buffer to store cancellation handler
69 struct pthread_unwind_buf
79 /* This is the placeholder of the public version. */
84 /* Pointer to the previous cleanup buffer. */
85 struct pthread_unwind_buf
*prev
;
87 /* Backward compatibility: state of the old-style cleanup
88 handler at the time of the previous new-style cleanup handler
90 struct _pthread_cleanup_buffer
*cleanup
;
92 /* Cancellation type before the push call. */
99 /* Opcodes and data types for communication with the signal handler to
100 change user/group IDs. */
109 /* Thread descriptor data structure. */
115 /* This overlaps the TCB as used for TLS without threads (see tls.h). */
120 int multiple_threads
;
124 /* This extra padding has no special purpose, and this structure layout
125 is private and subject to change without affecting the official ABI.
126 We just have it here in case it might be convenient for some
127 implementation-specific instrumentation hack or suchlike. */
131 /* This descriptor's link on the `stack_used' or `__stack_user' list. */
134 /* Thread ID - which is also a 'is this thread descriptor (and
135 therefore stack) used' flag. */
138 /* Process ID - thread group ID in kernel speak. */
141 /* List of cleanup buffers. */
142 struct _pthread_cleanup_buffer
*cleanup
;
144 /* Unwind information. */
145 struct pthread_unwind_buf
*cleanup_jmp_buf
;
146 #define HAVE_CLEANUP_JMP_BUF
148 /* Flags determining processing of cancellation. */
150 /* Bit set if cancellation is disabled. */
151 #define CANCELSTATE_BIT 0
152 #define CANCELSTATE_BITMASK 0x01
153 /* Bit set if asynchronous cancellation mode is selected. */
154 #define CANCELTYPE_BIT 1
155 #define CANCELTYPE_BITMASK 0x02
156 /* Bit set if canceling has been initiated. */
157 #define CANCELING_BIT 2
158 #define CANCELING_BITMASK 0x04
159 /* Bit set if canceled. */
160 #define CANCELED_BIT 3
161 #define CANCELED_BITMASK 0x08
162 /* Bit set if thread is exiting. */
163 #define EXITING_BIT 4
164 #define EXITING_BITMASK 0x10
165 /* Bit set if thread terminated and TCB is freed. */
166 #define TERMINATED_BIT 5
167 #define TERMINATED_BITMASK 0x20
168 /* Mask for the rest. Helps the compiler to optimize. */
169 #define CANCEL_RESTMASK 0xffffffc0
171 #define CANCEL_ENABLED_AND_CANCELED(value) \
172 (((value) & (CANCELSTATE_BITMASK | CANCELED_BITMASK | EXITING_BITMASK \
173 | CANCEL_RESTMASK | TERMINATED_BITMASK)) == CANCELED_BITMASK)
174 #define CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS(value) \
175 (((value) & (CANCELSTATE_BITMASK | CANCELTYPE_BITMASK | CANCELED_BITMASK \
176 | EXITING_BITMASK | CANCEL_RESTMASK | TERMINATED_BITMASK)) \
177 == (CANCELTYPE_BITMASK | CANCELED_BITMASK))
179 /* We allocate one block of references here. This should be enough
180 to avoid allocating any memory dynamically for most applications. */
181 struct pthread_key_data
183 /* Sequence number. We use uintptr_t to not require padding on
184 32- and 64-bit machines. On 64-bit machines it helps to avoid
190 } specific_1stblock
[PTHREAD_KEY_2NDLEVEL_SIZE
];
192 /* Flag which is set when specific data is set. */
195 /* Two-level array for the thread-specific data. */
196 struct pthread_key_data
*specific
[PTHREAD_KEY_1STLEVEL_SIZE
];
198 /* True if events must be reported. */
201 /* True if the user provided the stack. */
204 /* True if thread must stop at startup time. */
207 /* Lock to synchronize access to the descriptor. */
211 /* Offset of the CPU clock at start thread start time. */
212 hp_timing_t cpuclock_offset
;
215 /* If the thread waits to join another one the ID of the latter is
218 In case a thread is detached this field contains a pointer of the
219 TCB if the thread itself. This is something which cannot happen
220 in normal operation. */
221 struct pthread
*joinid
;
222 /* Check whether a thread is detached. */
223 #define IS_DETACHED(pd) ((pd)->joinid == (pd))
225 /* Flags. Including those copied from the thread attribute. */
228 /* The result of the thread function. */
231 /* Scheduling parameters for the new thread. */
232 struct sched_param schedparam
;
235 /* Start position of the code to be executed and the argument passed
237 void *(*start_routine
) (void *);
241 td_eventbuf_t eventbuf
;
242 /* Next descriptor with a pending event. */
243 struct pthread
*nextevent
;
245 #ifdef HAVE_FORCED_UNWIND
246 /* Machine-specific unwind info. */
247 struct _Unwind_Exception exc
;
250 /* If nonzero pointer to area allocated for the stack and its
253 size_t stackblock_size
;
254 /* Size of the included guard area. */
256 /* This is what the user specified and what we will report. */
257 size_t reported_guardsize
;
259 /* Resolver state. */
260 struct __res_state res
;
261 } __attribute ((aligned (TCB_ALIGNMENT
)));