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authorAustin Foxley <austinf@cetoncorp.com>2009-10-17 12:26:24 -0700
committerAustin Foxley <austinf@cetoncorp.com>2009-10-17 12:26:24 -0700
commitc68d0fa2d88fc2134a38d99e7e944828384a7671 (patch)
tree6596943bd1c77f18d6e49d4153ddd3f3d67b49f5 /libpthread/nptl/descr.h
parent9a03e98a3b418f33c347a6023e9320f3a42cb9e4 (diff)
libpthread/nptl: core of the "Native Posix Threading Library" for uClibc
targetting arm,sh,i386,mips,sparc for now Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
Diffstat (limited to 'libpthread/nptl/descr.h')
-rw-r--r--libpthread/nptl/descr.h271
1 files changed, 271 insertions, 0 deletions
diff --git a/libpthread/nptl/descr.h b/libpthread/nptl/descr.h
new file mode 100644
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+++ b/libpthread/nptl/descr.h
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+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _DESCR_H
+#define _DESCR_H 1
+
+#include <limits.h>
+#include <sched.h>
+#include <setjmp.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <hp-timing.h>
+#include <list.h>
+#include <lowlevellock.h>
+#include <pthreaddef.h>
+#include "../nptl_db/thread_db.h"
+#include <tls.h>
+#ifdef HAVE_FORCED_UNWIND
+# include <unwind.h>
+#endif
+#define __need_res_state
+#include <resolv.h>
+
+#ifndef TCB_ALIGNMENT
+# define TCB_ALIGNMENT sizeof (double)
+#endif
+
+
+/* We keep thread specific data in a special data structure, a two-level
+ array. The top-level array contains pointers to dynamically allocated
+ arrays of a certain number of data pointers. So we can implement a
+ sparse array. Each dynamic second-level array has
+ PTHREAD_KEY_2NDLEVEL_SIZE
+ entries. This value shouldn't be too large. */
+#define PTHREAD_KEY_2NDLEVEL_SIZE 32
+
+/* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE
+ keys in each subarray. */
+#define PTHREAD_KEY_1STLEVEL_SIZE \
+ ((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \
+ / PTHREAD_KEY_2NDLEVEL_SIZE)
+
+
+
+
+/* Internal version of the buffer to store cancellation handler
+ information. */
+struct pthread_unwind_buf
+{
+ struct
+ {
+ __jmp_buf jmp_buf;
+ int mask_was_saved;
+ } cancel_jmp_buf[1];
+
+ union
+ {
+ /* This is the placeholder of the public version. */
+ void *pad[4];
+
+ struct
+ {
+ /* Pointer to the previous cleanup buffer. */
+ struct pthread_unwind_buf *prev;
+
+ /* Backward compatibility: state of the old-style cleanup
+ handler at the time of the previous new-style cleanup handler
+ installment. */
+ struct _pthread_cleanup_buffer *cleanup;
+
+ /* Cancellation type before the push call. */
+ int canceltype;
+ } data;
+ } priv;
+};
+
+
+/* Opcodes and data types for communication with the signal handler to
+ change user/group IDs. */
+struct xid_command
+{
+ int syscall_no;
+ long int id[3];
+ volatile int cntr;
+};
+
+
+/* Thread descriptor data structure. */
+struct pthread
+{
+ union
+ {
+#if !defined(TLS_DTV_AT_TP)
+ /* This overlaps the TCB as used for TLS without threads (see tls.h). */
+ tcbhead_t header;
+#else
+ struct
+ {
+ int multiple_threads;
+ } header;
+#endif
+
+ /* This extra padding has no special purpose, and this structure layout
+ is private and subject to change without affecting the official ABI.
+ We just have it here in case it might be convenient for some
+ implementation-specific instrumentation hack or suchlike. */
+ void *__padding[16];
+ };
+
+ /* This descriptor's link on the `stack_used' or `__stack_user' list. */
+ list_t list;
+
+ /* Thread ID - which is also a 'is this thread descriptor (and
+ therefore stack) used' flag. */
+ pid_t tid;
+
+ /* Process ID - thread group ID in kernel speak. */
+ pid_t pid;
+
+ /* List of cleanup buffers. */
+ struct _pthread_cleanup_buffer *cleanup;
+
+ /* Unwind information. */
+ struct pthread_unwind_buf *cleanup_jmp_buf;
+#define HAVE_CLEANUP_JMP_BUF
+
+ /* Flags determining processing of cancellation. */
+ int cancelhandling;
+ /* Bit set if cancellation is disabled. */
+#define CANCELSTATE_BIT 0
+#define CANCELSTATE_BITMASK 0x01
+ /* Bit set if asynchronous cancellation mode is selected. */
+#define CANCELTYPE_BIT 1
+#define CANCELTYPE_BITMASK 0x02
+ /* Bit set if canceling has been initiated. */
+#define CANCELING_BIT 2
+#define CANCELING_BITMASK 0x04
+ /* Bit set if canceled. */
+#define CANCELED_BIT 3
+#define CANCELED_BITMASK 0x08
+ /* Bit set if thread is exiting. */
+#define EXITING_BIT 4
+#define EXITING_BITMASK 0x10
+ /* Bit set if thread terminated and TCB is freed. */
+#define TERMINATED_BIT 5
+#define TERMINATED_BITMASK 0x20
+ /* Bit set if thread is supposed to change XID. */
+#define SETXID_BIT 6
+#define SETXID_BITMASK 0x40
+ /* Mask for the rest. Helps the compiler to optimize. */
+#define CANCEL_RESTMASK 0xffffff80
+
+#define CANCEL_ENABLED_AND_CANCELED(value) \
+ (((value) & (CANCELSTATE_BITMASK | CANCELED_BITMASK | EXITING_BITMASK \
+ | CANCEL_RESTMASK | TERMINATED_BITMASK)) == CANCELED_BITMASK)
+#define CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS(value) \
+ (((value) & (CANCELSTATE_BITMASK | CANCELTYPE_BITMASK | CANCELED_BITMASK \
+ | EXITING_BITMASK | CANCEL_RESTMASK | TERMINATED_BITMASK)) \
+ == (CANCELTYPE_BITMASK | CANCELED_BITMASK))
+
+ /* We allocate one block of references here. This should be enough
+ to avoid allocating any memory dynamically for most applications. */
+ struct pthread_key_data
+ {
+ /* Sequence number. We use uintptr_t to not require padding on
+ 32- and 64-bit machines. On 64-bit machines it helps to avoid
+ wrapping, too. */
+ uintptr_t seq;
+
+ /* Data pointer. */
+ void *data;
+ } specific_1stblock[PTHREAD_KEY_2NDLEVEL_SIZE];
+
+ /* Flag which is set when specific data is set. */
+ bool specific_used;
+
+ /* Two-level array for the thread-specific data. */
+ struct pthread_key_data *specific[PTHREAD_KEY_1STLEVEL_SIZE];
+
+ /* True if events must be reported. */
+ bool report_events;
+
+ /* True if the user provided the stack. */
+ bool user_stack;
+
+ /* True if thread must stop at startup time. */
+ bool stopped_start;
+
+ /* Lock to synchronize access to the descriptor. */
+ lll_lock_t lock;
+
+ /* Lock for synchronizing setxid calls. */
+ lll_lock_t setxid_futex;
+
+#if HP_TIMING_AVAIL
+ /* Offset of the CPU clock at start thread start time. */
+ hp_timing_t cpuclock_offset;
+#endif
+
+ /* If the thread waits to join another one the ID of the latter is
+ stored here.
+
+ In case a thread is detached this field contains a pointer of the
+ TCB if the thread itself. This is something which cannot happen
+ in normal operation. */
+ struct pthread *joinid;
+ /* Check whether a thread is detached. */
+#define IS_DETACHED(pd) ((pd)->joinid == (pd))
+
+ /* Flags. Including those copied from the thread attribute. */
+ int flags;
+
+ /* The result of the thread function. */
+ void *result;
+
+ /* Scheduling parameters for the new thread. */
+ struct sched_param schedparam;
+ int schedpolicy;
+
+ /* Start position of the code to be executed and the argument passed
+ to the function. */
+ void *(*start_routine) (void *);
+ void *arg;
+
+ /* Debug state. */
+ td_eventbuf_t eventbuf;
+ /* Next descriptor with a pending event. */
+ struct pthread *nextevent;
+
+#ifdef HAVE_FORCED_UNWIND
+ /* Machine-specific unwind info. */
+ struct _Unwind_Exception exc;
+#endif
+
+ /* If nonzero pointer to area allocated for the stack and its
+ size. */
+ void *stackblock;
+ size_t stackblock_size;
+ /* Size of the included guard area. */
+ size_t guardsize;
+ /* This is what the user specified and what we will report. */
+ size_t reported_guardsize;
+
+ /* Resolver state. */
+ struct __res_state res;
+
+ /* This member must be last. */
+ char end_padding[];
+
+#define PTHREAD_STRUCT_END_PADDING \
+ (sizeof (struct pthread) - offsetof (struct pthread, end_padding))
+} __attribute ((aligned (TCB_ALIGNMENT)));
+
+
+#endif /* descr.h */