| /* Linuxthreads - a simple clone()-based implementation of Posix */ |
| /* threads for Linux. */ |
| /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ |
| /* */ |
| /* This program 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 program 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. */ |
| |
| #ifndef _DESCR_H |
| #define _DESCR_H 1 |
| |
| #define __need_res_state |
| #include <resolv.h> |
| #include <sched.h> |
| #include <setjmp.h> |
| #include <signal.h> |
| #include <stdint.h> |
| #include <sys/types.h> |
| #include <hp-timing.h> |
| #ifdef USE_TLS |
| #include <tls.h> |
| #endif |
| #include "uClibc-glue.h" |
| |
| /* Fast thread-specific data internal to libc. */ |
| enum __libc_tsd_key_t { _LIBC_TSD_KEY_MALLOC = 0, |
| _LIBC_TSD_KEY_DL_ERROR, |
| _LIBC_TSD_KEY_RPC_VARS, |
| _LIBC_TSD_KEY_LOCALE, |
| _LIBC_TSD_KEY_CTYPE_B, |
| _LIBC_TSD_KEY_CTYPE_TOLOWER, |
| _LIBC_TSD_KEY_CTYPE_TOUPPER, |
| _LIBC_TSD_KEY_N }; |
| |
| /* The type of thread descriptors */ |
| typedef struct _pthread_descr_struct *pthread_descr; |
| |
| |
| /* Some more includes. */ |
| #include <pt-machine.h> |
| #include <linuxthreads_db/thread_dbP.h> |
| |
| |
| /* Arguments passed to thread creation routine */ |
| struct pthread_start_args { |
| void *(*start_routine)(void *); /* function to run */ |
| void *arg; /* its argument */ |
| sigset_t mask; /* initial signal mask for thread */ |
| int schedpolicy; /* initial scheduling policy (if any) */ |
| struct sched_param schedparam; /* initial scheduling parameters (if any) */ |
| }; |
| |
| |
| /* Callback interface for removing the thread from waiting on an |
| object if it is cancelled while waiting or about to wait. |
| This hold a pointer to the object, and a pointer to a function |
| which ``extricates'' the thread from its enqueued state. |
| The function takes two arguments: pointer to the wait object, |
| and a pointer to the thread. It returns 1 if an extrication |
| actually occured, and hence the thread must also be signalled. |
| It returns 0 if the thread had already been extricated. */ |
| typedef struct _pthread_extricate_struct { |
| void *pu_object; |
| int (*pu_extricate_func)(void *, pthread_descr); |
| } pthread_extricate_if; |
| |
| |
| /* Atomic counter made possible by compare_and_swap */ |
| struct pthread_atomic { |
| long p_count; |
| int p_spinlock; |
| }; |
| |
| |
| /* Context info for read write locks. The pthread_rwlock_info structure |
| is information about a lock that has been read-locked by the thread |
| in whose list this structure appears. The pthread_rwlock_context |
| is embedded in the thread context and contains a pointer to the |
| head of the list of lock info structures, as well as a count of |
| read locks that are untracked, because no info structure could be |
| allocated for them. */ |
| struct _pthread_rwlock_t; |
| typedef struct _pthread_rwlock_info { |
| struct _pthread_rwlock_info *pr_next; |
| struct _pthread_rwlock_t *pr_lock; |
| int pr_lock_count; |
| } pthread_readlock_info; |
| |
| |
| /* 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) |
| |
| |
| union dtv; |
| |
| struct _pthread_descr_struct |
| { |
| #if !defined USE_TLS || !TLS_DTV_AT_TP || INCLUDE_TLS_PADDING |
| /* This overlaps tcbhead_t (see tls.h), as used for TLS without threads. */ |
| union |
| { |
| struct |
| { |
| void *tcb; /* Pointer to the TCB. This is not always |
| the address of this thread descriptor. */ |
| union dtv *dtvp; |
| pthread_descr self; /* Pointer to this structure */ |
| int multiple_threads; |
| uintptr_t sysinfo; |
| } data; |
| void *__padding[16]; |
| } p_header; |
| # define p_multiple_threads p_header.data.multiple_threads |
| #elif defined TLS_MULTIPLE_THREADS_IN_TCB && TLS_MULTIPLE_THREADS_IN_TCB |
| int p_multiple_threads; |
| #endif |
| |
| pthread_descr p_nextlive, p_prevlive; |
| /* Double chaining of active threads */ |
| pthread_descr p_nextwaiting; /* Next element in the queue holding the thr */ |
| pthread_descr p_nextlock; /* can be on a queue and waiting on a lock */ |
| pthread_t p_tid; /* Thread identifier */ |
| int p_pid; /* PID of Unix process */ |
| int p_priority; /* Thread priority (== 0 if not realtime) */ |
| struct _pthread_fastlock * p_lock; /* Spinlock for synchronized accesses */ |
| int p_signal; /* last signal received */ |
| sigjmp_buf * p_signal_jmp; /* where to siglongjmp on a signal or NULL */ |
| sigjmp_buf * p_cancel_jmp; /* where to siglongjmp on a cancel or NULL */ |
| char p_terminated; /* true if terminated e.g. by pthread_exit */ |
| char p_detached; /* true if detached */ |
| char p_exited; /* true if the assoc. process terminated */ |
| void * p_retval; /* placeholder for return value */ |
| int p_retcode; /* placeholder for return code */ |
| pthread_descr p_joining; /* thread joining on that thread or NULL */ |
| struct _pthread_cleanup_buffer * p_cleanup; /* cleanup functions */ |
| char p_cancelstate; /* cancellation state */ |
| char p_canceltype; /* cancellation type (deferred/async) */ |
| char p_canceled; /* cancellation request pending */ |
| char * p_in_sighandler; /* stack address of sighandler, or NULL */ |
| char p_sigwaiting; /* true if a sigwait() is in progress */ |
| struct pthread_start_args p_start_args; /* arguments for thread creation */ |
| void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE]; /* thread-specific data */ |
| #if !(USE_TLS && HAVE___THREAD) |
| void * p_libc_specific[_LIBC_TSD_KEY_N]; /* thread-specific data for libc */ |
| int * p_errnop; /* pointer to used errno variable */ |
| int p_errno; /* error returned by last system call */ |
| int * p_h_errnop; /* pointer to used h_errno variable */ |
| int p_h_errno; /* error returned by last netdb function */ |
| struct __res_state *p_resp; /* Pointer to resolver state */ |
| #endif |
| struct __res_state p_res; /* per-thread resolver state */ |
| int p_userstack; /* nonzero if the user provided the stack */ |
| void *p_guardaddr; /* address of guard area or NULL */ |
| size_t p_guardsize; /* size of guard area */ |
| int p_nr; /* Index of descriptor in __pthread_handles */ |
| int p_report_events; /* Nonzero if events must be reported. */ |
| td_eventbuf_t p_eventbuf; /* Data for event. */ |
| struct pthread_atomic p_resume_count; /* number of times restart() was |
| called on thread */ |
| char p_woken_by_cancel; /* cancellation performed wakeup */ |
| char p_condvar_avail; /* flag if conditional variable became avail */ |
| char p_sem_avail; /* flag if semaphore became available */ |
| pthread_extricate_if *p_extricate; /* See above */ |
| pthread_readlock_info *p_readlock_list; /* List of readlock info structs */ |
| pthread_readlock_info *p_readlock_free; /* Free list of structs */ |
| int p_untracked_readlock_count; /* Readlocks not tracked by list */ |
| int p_inheritsched; /* copied from the thread attribute */ |
| #if HP_TIMING_AVAIL |
| hp_timing_t p_cpuclock_offset; /* Initial CPU clock for thread. */ |
| #endif |
| #ifdef USE_TLS |
| char *p_stackaddr; /* Stack address. */ |
| #endif |
| size_t p_alloca_cutoff; /* Maximum size which should be allocated |
| using alloca() instead of malloc(). */ |
| /* New elements must be added at the end. */ |
| } __attribute__ ((aligned(32))); /* We need to align the structure so that |
| doubles are aligned properly. This is 8 |
| bytes on MIPS and 16 bytes on MIPS64. |
| 32 bytes might give better cache |
| utilization. */ |
| |
| |
| |
| /* Limit between the stack of the initial thread (above) and the |
| stacks of other threads (below). Aligned on a STACK_SIZE boundary. |
| Initially 0, meaning that the current thread is (by definition) |
| the initial thread. */ |
| |
| extern char *__pthread_initial_thread_bos; |
| |
| /* Descriptor of the initial thread */ |
| |
| extern struct _pthread_descr_struct __pthread_initial_thread; |
| |
| /* Limits of the thread manager stack. */ |
| |
| extern char *__pthread_manager_thread_bos; |
| extern char *__pthread_manager_thread_tos; |
| |
| /* Descriptor of the manager thread */ |
| |
| extern struct _pthread_descr_struct __pthread_manager_thread; |
| extern pthread_descr __pthread_manager_threadp attribute_hidden; |
| |
| /* Indicate whether at least one thread has a user-defined stack (if 1), |
| or all threads have stacks supplied by LinuxThreads (if 0). */ |
| |
| extern int __pthread_nonstandard_stacks; |
| |
| /* The max size of the thread stack segments. If the default |
| THREAD_SELF implementation is used, this must be a power of two and |
| a multiple of PAGE_SIZE. */ |
| #ifndef STACK_SIZE |
| #define STACK_SIZE (2 * 1024 * 1024) |
| #endif |
| |
| /* Get some notion of the current stack. Need not be exactly the top |
| of the stack, just something somewhere in the current frame. */ |
| #ifndef CURRENT_STACK_FRAME |
| #define CURRENT_STACK_FRAME ({ char __csf; &__csf; }) |
| #endif |
| |
| /* Recover thread descriptor for the current thread */ |
| |
| extern pthread_descr __pthread_find_self (void) __attribute__ ((pure)); |
| |
| static __inline__ pthread_descr thread_self (void) __attribute__ ((pure)); |
| static __inline__ pthread_descr thread_self (void) |
| { |
| #ifdef THREAD_SELF |
| return THREAD_SELF; |
| #else |
| char *sp = CURRENT_STACK_FRAME; |
| if (sp >= __pthread_initial_thread_bos) |
| return &__pthread_initial_thread; |
| else if (sp >= __pthread_manager_thread_bos |
| && sp < __pthread_manager_thread_tos) |
| return &__pthread_manager_thread; |
| else if (__pthread_nonstandard_stacks) |
| return __pthread_find_self(); |
| else |
| #ifdef _STACK_GROWS_DOWN |
| return (pthread_descr)(((unsigned long)sp | (STACK_SIZE-1))+1) - 1; |
| #else |
| return (pthread_descr)((unsigned long)sp &~ (STACK_SIZE-1)); |
| #endif |
| #endif |
| } |
| |
| #endif /* descr.h */ |