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 #include <lowlevellock.h>
31 #include <pthreaddef.h>
32 #include <dl-sysdep.h>
33 #include "../nptl_db/thread_db.h"
35 #ifdef HAVE_FORCED_UNWIND
38 #define __need_res_state
42 # define TCB_ALIGNMENT sizeof (double)
46 /* We keep thread specific data in a special data structure, a two-level
47 array. The top-level array contains pointers to dynamically allocated
48 arrays of a certain number of data pointers. So we can implement a
49 sparse array. Each dynamic second-level array has
50 PTHREAD_KEY_2NDLEVEL_SIZE
51 entries. This value shouldn't be too large. */
52 #define PTHREAD_KEY_2NDLEVEL_SIZE 32
54 /* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE
55 keys in each subarray. */
56 #define PTHREAD_KEY_1STLEVEL_SIZE \
57 ((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \
58 / PTHREAD_KEY_2NDLEVEL_SIZE)
63 /* Internal version of the buffer to store cancellation handler
65 struct pthread_unwind_buf
75 /* This is the placeholder of the public version. */
80 /* Pointer to the previous cleanup buffer. */
81 struct pthread_unwind_buf *prev;
83 /* Backward compatibility: state of the old-style cleanup
84 handler at the time of the previous new-style cleanup handler
86 struct _pthread_cleanup_buffer *cleanup;
88 /* Cancellation type before the push call. */
95 /* Thread descriptor data structure. */
101 /* This overlaps the TCB as used for TLS without threads (see tls.h). */
106 int multiple_threads;
110 /* This extra padding has no special purpose, and this structure layout
111 is private and subject to change without affecting the official ABI.
112 We just have it here in case it might be convenient for some
113 implementation-specific instrumentation hack or suchlike. */
117 /* This descriptor's link on the `stack_used' or `__stack_user' list. */
120 /* Thread ID - which is also a 'is this thread descriptor (and
121 therefore stack) used' flag. */
124 /* Process ID - thread group ID in kernel speak. */
127 /* List of cleanup buffers. */
128 struct _pthread_cleanup_buffer *cleanup;
130 /* Unwind information. */
131 struct pthread_unwind_buf *cleanup_jmp_buf;
132 #define HAVE_CLEANUP_JMP_BUF
134 /* Flags determining processing of cancellation. */
136 /* Bit set if cancellation is disabled. */
137 #define CANCELSTATE_BIT 0
138 #define CANCELSTATE_BITMASK 0x01
139 /* Bit set if asynchronous cancellation mode is selected. */
140 #define CANCELTYPE_BIT 1
141 #define CANCELTYPE_BITMASK 0x02
142 /* Bit set if canceling has been initiated. */
143 #define CANCELING_BIT 2
144 #define CANCELING_BITMASK 0x04
145 /* Bit set if canceled. */
146 #define CANCELED_BIT 3
147 #define CANCELED_BITMASK 0x08
148 /* Bit set if thread is exiting. */
149 #define EXITING_BIT 4
150 #define EXITING_BITMASK 0x10
151 /* Bit set if thread terminated and TCB is freed. */
152 #define TERMINATED_BIT 5
153 #define TERMINATED_BITMASK 0x20
154 /* Mask for the rest. Helps the compiler to optimize. */
155 #define CANCEL_RESTMASK 0xffffffc0
157 #define CANCEL_ENABLED_AND_CANCELED(value) \
158 (((value) & (CANCELSTATE_BITMASK | CANCELED_BITMASK | EXITING_BITMASK \
159 | CANCEL_RESTMASK | TERMINATED_BITMASK)) == CANCELED_BITMASK)
160 #define CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS(value) \
161 (((value) & (CANCELSTATE_BITMASK | CANCELTYPE_BITMASK | CANCELED_BITMASK \
162 | EXITING_BITMASK | CANCEL_RESTMASK | TERMINATED_BITMASK)) \
163 == (CANCELTYPE_BITMASK | CANCELED_BITMASK))
165 /* We allocate one block of references here. This should be enough
166 to avoid allocating any memory dynamically for most applications. */
167 struct pthread_key_data
169 /* Sequence number. We use uintptr_t to not require padding on
170 32- and 64-bit machines. On 64-bit machines it helps to avoid
176 } specific_1stblock[PTHREAD_KEY_2NDLEVEL_SIZE];
178 /* Flag which is set when specific data is set. */
181 /* Two-level array for the thread-specific data. */
182 struct pthread_key_data *specific[PTHREAD_KEY_1STLEVEL_SIZE];
184 /* True if events must be reported. */
187 /* True if the user provided the stack. */
190 /* Lock to synchronize access to the descriptor. */
194 /* Offset of the CPU clock at start thread start time. */
195 hp_timing_t cpuclock_offset;
198 /* If the thread waits to join another one the ID of the latter is
201 In case a thread is detached this field contains a pointer of the
202 TCB if the thread itself. This is something which cannot happen
203 in normal operation. */
204 struct pthread *joinid;
205 /* Check whether a thread is detached. */
206 #define IS_DETACHED(pd) ((pd)->joinid == (pd))
208 /* Flags. Including those copied from the thread attribute. */
211 /* The result of the thread function. */
214 /* Scheduling parameters for the new thread. */
215 struct sched_param schedparam;
218 /* Start position of the code to be executed and the argument passed
220 void *(*start_routine) (void *);
224 td_eventbuf_t eventbuf;
225 /* Next descriptor with a pending event. */
226 struct pthread *nextevent;
228 #ifdef HAVE_FORCED_UNWIND
229 /* Machine-specific unwind info. */
230 struct _Unwind_Exception exc;
233 /* If nonzero pointer to area allocated for the stack and its
236 size_t stackblock_size;
237 /* Size of the included guard area. */
239 /* This is what the user specified and what we will report. */
240 size_t reported_guardsize;
242 /* Resolver state. */
243 struct __res_state res;
244 } __attribute ((aligned (TCB_ALIGNMENT)));