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- /* 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 _INTERNALS_H
- #define _INTERNALS_H 1
- /* Internal data structures */
- /* Includes */
- #include <bits/libc-tsd.h> /* for _LIBC_TSD_KEY_N */
- #include <limits.h>
- #include <setjmp.h>
- #include <signal.h>
- #include <unistd.h>
- #include <sys/types.h>
- #include "pt-machine.h"
- #include "semaphore.h"
- #include "../linuxthreads_db/thread_dbP.h"
- #ifdef __UCLIBC_HAS_XLOCALE__
- #include <bits/uClibc_locale.h>
- #endif /* __UCLIBC_HAS_XLOCALE__ */
- /* Use a funky version in a probably vein attempt at preventing gdb
- * from dlopen()'ing glibc's libthread_db library... */
- #define STRINGIFY(s) STRINGIFY2 (s)
- #define STRINGIFY2(s) #s
- #define VERSION STRINGIFY(__UCLIBC_MAJOR__) "." STRINGIFY(__UCLIBC_MINOR__) "." STRINGIFY(__UCLIBC_SUBLEVEL__)
- #ifndef THREAD_GETMEM
- # define THREAD_GETMEM(descr, member) descr->member
- #endif
- #ifndef THREAD_GETMEM_NC
- # define THREAD_GETMEM_NC(descr, member) descr->member
- #endif
- #ifndef THREAD_SETMEM
- # define THREAD_SETMEM(descr, member, value) descr->member = (value)
- #endif
- #ifndef THREAD_SETMEM_NC
- # define THREAD_SETMEM_NC(descr, member, value) descr->member = (value)
- #endif
- /* 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) */
- };
- /* 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)
- typedef void (*destr_function)(void *);
- struct pthread_key_struct {
- int in_use; /* already allocated? */
- destr_function destr; /* destruction routine */
- };
- #define PTHREAD_START_ARGS_INITIALIZER { NULL, NULL, {{0, }}, 0, { 0 } }
- /* The type of thread descriptors */
- typedef struct _pthread_descr_struct * pthread_descr;
- /* 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;
- struct _pthread_descr_struct {
- 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 */
- 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 */
- 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 */
- void * p_libc_specific[_LIBC_TSD_KEY_N]; /* thread-specific data for libc */
- 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 */
- pthread_descr p_self; /* Pointer to this structure */
- 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 */
- /* New elements must be added at the end. */
- #ifdef __UCLIBC_HAS_XLOCALE__
- __locale_t locale; /* thread-specific locale from uselocale() only! */
- #endif /* __UCLIBC_HAS_XLOCALE__ */
- } __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. */
- /* The type of thread handles. */
- typedef struct pthread_handle_struct * pthread_handle;
- struct pthread_handle_struct {
- struct _pthread_fastlock h_lock; /* Fast lock for sychronized access */
- pthread_descr h_descr; /* Thread descriptor or NULL if invalid */
- char * h_bottom; /* Lowest address in the stack thread */
- };
- /* The type of messages sent to the thread manager thread */
- struct pthread_request {
- pthread_descr req_thread; /* Thread doing the request */
- enum { /* Request kind */
- REQ_CREATE, REQ_FREE, REQ_PROCESS_EXIT, REQ_MAIN_THREAD_EXIT,
- REQ_POST, REQ_DEBUG, REQ_KICK
- } req_kind;
- union { /* Arguments for request */
- struct { /* For REQ_CREATE: */
- const pthread_attr_t * attr; /* thread attributes */
- void * (*fn)(void *); /* start function */
- void * arg; /* argument to start function */
- sigset_t mask; /* signal mask */
- } create;
- struct { /* For REQ_FREE: */
- pthread_t thread_id; /* identifier of thread to free */
- } free;
- struct { /* For REQ_PROCESS_EXIT: */
- int code; /* exit status */
- } exit;
- void * post; /* For REQ_POST: the semaphore */
- } req_args;
- };
- /* Signals used for suspend/restart and for cancellation notification. */
- extern int __pthread_sig_restart;
- extern int __pthread_sig_cancel;
- /* Signal used for interfacing with gdb */
- extern int __pthread_sig_debug;
- /* Global array of thread handles, used for validating a thread id
- and retrieving the corresponding thread descriptor. Also used for
- mapping the available stack segments. */
- extern struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX];
- /* Descriptor of the initial thread */
- extern struct _pthread_descr_struct __pthread_initial_thread;
- /* Descriptor of the manager thread */
- extern struct _pthread_descr_struct __pthread_manager_thread;
- /* Descriptor of the main thread */
- extern pthread_descr __pthread_main_thread;
- /* 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. */
- /* For non-MMU systems also remember to stack top of the initial thread.
- * This is adapted when other stacks are malloc'ed since we don't know
- * the bounds a-priori. -StS */
- extern char *__pthread_initial_thread_bos;
- #ifndef __ARCH_HAS_MMU__
- extern char *__pthread_initial_thread_tos;
- #define NOMMU_INITIAL_THREAD_BOUNDS(tos,bos) if ((tos)>=__pthread_initial_thread_bos && (bos)<=__pthread_initial_thread_tos) __pthread_initial_thread_bos = (tos)+1
- #else
- #define NOMMU_INITIAL_THREAD_BOUNDS(tos,bos) /* empty */
- #endif /* __ARCH_HAS_MMU__ */
- /* 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;
- /* File descriptor for sending requests to the thread manager.
- Initially -1, meaning that __pthread_initialize_manager must be called. */
- extern int __pthread_manager_request;
- /* Other end of the pipe for sending requests to the thread manager. */
- extern int __pthread_manager_reader;
- /* Limits of the thread manager stack. */
- extern char *__pthread_manager_thread_bos;
- extern char *__pthread_manager_thread_tos;
- /* Pending request for a process-wide exit */
- extern int __pthread_exit_requested, __pthread_exit_code;
- /* Set to 1 by gdb if we're debugging */
- extern volatile int __pthread_threads_debug;
- /* Globally enabled events. */
- extern volatile td_thr_events_t __pthread_threads_events;
- /* Pointer to descriptor of thread with last event. */
- extern volatile pthread_descr __pthread_last_event;
- /* Return the handle corresponding to a thread id */
- static inline pthread_handle thread_handle(pthread_t id)
- {
- return &__pthread_handles[id % PTHREAD_THREADS_MAX];
- }
- /* Validate a thread handle. Must have acquired h->h_spinlock before. */
- static inline int invalid_handle(pthread_handle h, pthread_t id)
- {
- return h->h_descr == NULL || h->h_descr->p_tid != id;
- }
- /* Fill in defaults left unspecified by pt-machine.h. */
- /* The page size we can get from the system. This should likely not be
- changed by the machine file but, you never know. */
- #ifndef PAGE_SIZE
- #define PAGE_SIZE (sysconf (_SC_PAGE_SIZE))
- #endif
- /* 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
- #ifdef __ARCH_HAS_MMU__
- #define STACK_SIZE (2 * 1024 * 1024)
- #else
- #define STACK_SIZE (4 * PAGE_SIZE)
- #endif
- #endif
- /* The initial size of the thread stack. Must be a multiple of PAGE_SIZE. */
- #ifndef INITIAL_STACK_SIZE
- #define INITIAL_STACK_SIZE (4 * PAGE_SIZE)
- #endif
- /* Size of the thread manager stack. The "- 32" avoids wasting space
- with some malloc() implementations. */
- #ifndef THREAD_MANAGER_STACK_SIZE
- #define THREAD_MANAGER_STACK_SIZE (2 * PAGE_SIZE - 32)
- #endif
- /* The base of the "array" of thread stacks. The array will grow down from
- here. Defaults to the calculated bottom of the initial application
- stack. */
- #ifndef THREAD_STACK_START_ADDRESS
- #define THREAD_STACK_START_ADDRESS __pthread_initial_thread_bos
- #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
- /* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the
- architecture doesn't need a memory barrier instruction (e.g. Intel
- x86). Still we need the compiler to respect the barrier and emit
- all outstanding operations which modify memory. Some architectures
- distinguish between full, read and write barriers. */
- #ifndef MEMORY_BARRIER
- #define MEMORY_BARRIER() asm ("" : : : "memory")
- #endif
- #ifndef READ_MEMORY_BARRIER
- #define READ_MEMORY_BARRIER() MEMORY_BARRIER()
- #endif
- #ifndef WRITE_MEMORY_BARRIER
- #define WRITE_MEMORY_BARRIER() MEMORY_BARRIER()
- #endif
- /* Recover thread descriptor for the current thread */
- extern pthread_descr __pthread_find_self (void) __attribute__ ((const));
- static inline pthread_descr thread_self (void) __attribute__ ((const));
- static inline pthread_descr thread_self (void)
- {
- #ifdef THREAD_SELF
- return THREAD_SELF;
- #else
- char *sp = CURRENT_STACK_FRAME;
- #ifdef __ARCH_HAS_MMU__
- 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
- return (pthread_descr)(((unsigned long)sp | (STACK_SIZE-1))+1) - 1;
- #else
- /* For non-MMU we need to be more careful about the initial thread stack.
- * We refine the initial thread stack bounds dynamically as we allocate
- * the other stack frame such that it doesn't overlap with them. Then
- * we can be sure to pick the right thread according to the current SP */
- /* Since we allow other stack frames to be above or below, we need to
- * treat this case special. When pthread_initialize() wasn't called yet,
- * only the initial thread is there. */
- if (__pthread_initial_thread_bos == NULL) {
- return &__pthread_initial_thread;
- }
- else if (sp >= __pthread_initial_thread_bos
- && sp < __pthread_initial_thread_tos) {
- return &__pthread_initial_thread;
- }
- else if (sp >= __pthread_manager_thread_bos
- && sp < __pthread_manager_thread_tos) {
- return &__pthread_manager_thread;
- }
- else {
- return __pthread_find_self();
- }
- #endif /* __ARCH_HAS_MMU__ */
- #endif
- }
- /* Max number of times we must spin on a spinlock calling sched_yield().
- After MAX_SPIN_COUNT iterations, we put the calling thread to sleep. */
- #ifndef MAX_SPIN_COUNT
- #define MAX_SPIN_COUNT 50
- #endif
- /* Duration of sleep (in nanoseconds) when we can't acquire a spinlock
- after MAX_SPIN_COUNT iterations of sched_yield().
- With the 2.0 and 2.1 kernels, this MUST BE > 2ms.
- (Otherwise the kernel does busy-waiting for realtime threads,
- giving other threads no chance to run.) */
- #ifndef SPIN_SLEEP_DURATION
- #define SPIN_SLEEP_DURATION 2000001
- #endif
- /* Debugging */
- #ifdef DEBUG
- #include <assert.h>
- #define ASSERT assert
- #define MSG __pthread_message
- #else
- #define ASSERT(x)
- #define MSG(msg,arg...)
- #endif
- /* Internal global functions */
- void __pthread_destroy_specifics(void);
- void __pthread_perform_cleanup(void);
- int __pthread_initialize_manager(void);
- void __pthread_message(char * fmt, ...);
- int __pthread_manager(void *reqfd);
- int __pthread_manager_event(void *reqfd);
- void __pthread_manager_sighandler(int sig);
- void __pthread_reset_main_thread(void);
- void __fresetlockfiles(void);
- void __pthread_manager_adjust_prio(int thread_prio);
- void __pthread_initialize_minimal (void);
- extern int __pthread_attr_setguardsize __P ((pthread_attr_t *__attr,
- size_t __guardsize));
- extern int __pthread_attr_getguardsize __P ((__const pthread_attr_t *__attr,
- size_t *__guardsize));
- extern int __pthread_attr_setstackaddr __P ((pthread_attr_t *__attr,
- void *__stackaddr));
- extern int __pthread_attr_getstackaddr __P ((__const pthread_attr_t *__attr,
- void **__stackaddr));
- extern int __pthread_attr_setstacksize __P ((pthread_attr_t *__attr,
- size_t __stacksize));
- extern int __pthread_attr_getstacksize __P ((__const pthread_attr_t *__attr,
- size_t *__stacksize));
- extern int __pthread_getconcurrency __P ((void));
- extern int __pthread_setconcurrency __P ((int __level));
- extern int __pthread_mutexattr_gettype __P ((__const pthread_mutexattr_t *__attr,
- int *__kind));
- extern void __pthread_kill_other_threads_np __P ((void));
- extern void __pthread_restart_old(pthread_descr th);
- extern void __pthread_suspend_old(pthread_descr self);
- extern int __pthread_timedsuspend_old(pthread_descr self, const struct timespec *abs);
- extern void __pthread_restart_new(pthread_descr th);
- extern void __pthread_suspend_new(pthread_descr self);
- extern int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abs);
- extern void __pthread_wait_for_restart_signal(pthread_descr self);
- /* Global pointers to old or new suspend functions */
- extern void (*__pthread_restart)(pthread_descr);
- extern void (*__pthread_suspend)(pthread_descr);
- /* Prototypes for the function without cancelation support when the
- normal version has it. */
- extern int __libc_close (int fd);
- extern int __libc_nanosleep (const struct timespec *requested_time,
- struct timespec *remaining);
- extern ssize_t __libc_read (int fd, void *buf, size_t count);
- extern pid_t __libc_waitpid (pid_t pid, int *stat_loc, int options);
- extern ssize_t __libc_write (int fd, const void *buf, size_t count);
- /* Prototypes for some of the new semaphore functions. */
- extern int __new_sem_post (sem_t * sem);
- /* The functions called the signal events. */
- extern void __linuxthreads_create_event (void);
- extern void __linuxthreads_death_event (void);
- extern void __linuxthreads_reap_event (void);
- #endif /* internals.h */
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