pprivate.h

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#ifndef CYGONCE_PPRIVATE_H
#define CYGONCE_PPRIVATE_H
//=============================================================================
//
//      pprivate.h
//
//      POSIX types header
//
//=============================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos 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 General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     nickg
// Contributors:  nickg
// Date:          2000-03-17
// Purpose:       POSIX private header
// Description:   This header contains various POSIX type definitions that are
//                shared between the various parts of the POSIX package.
//              
// Usage:         #include <pprivate.h>
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <pkgconf/hal.h>
#include <pkgconf/kernel.h>
#include <pkgconf/posix.h>

#include <stddef.h>                     // NULL, size_t

#include <sys/types.h>
#include <sched.h>
#include <pthread.h>
#include <errno.h>                      // error codes
#include <signal.h>                     // sigset_t
#include <limits.h>                     // PTHREAD_KEYS_MAX

#include <cyg/posix/export.h>           // POSIX exports header

#include <cyg/kernel/thread.hxx>        // thread definitions
#include <cyg/kernel/mutex.hxx>         // mutex definitions

//=============================================================================
// Constructor prioritization

// Prioritization for POSIX library support objects
#define CYGBLD_POSIX_INIT CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_COMPAT)

// Prioritization for POSIX library startup initialization. This must
// come after CYGBLD_POSIX_INIT constructors.
#define CYGBLD_POSIX_START CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_COMPAT+5)

//=============================================================================
// Thread control data structure

// Per-thread information needed by POSIX
// This is pointed to by the CYGNUM_KERNEL_THREADS_DATA_POSIX entry of the
// per-thread data.

#ifdef CYGPKG_POSIX_PTHREAD
typedef struct
{
    unsigned int        state:4,                // Thread state
                        cancelstate:2,          // Cancel state of thread
                        canceltype:2,           // Cancel type of thread
                        cancelpending:1,        // pending cancel flag
                        freestack:1;            // stack malloced, must be freed

    pthread_t           id;                     // My thread ID
    Cyg_Thread          *thread;                // pointer to eCos thread object
    pthread_attr_t      attr;                   // Current thread attributes
    void                *retval;                // return value
    void                *(*start_routine)(void *); // start routine
    void                *start_arg;             // argument to start routine
    char                name[20];               // name string for debugging
    Cyg_Condition_Variable *joiner;             // joining threads wait here
    CYG_ADDRWORD        stackmem;               // base of stack memory area
                                                // only valid if freestack == true

    struct pthread_cleanup_buffer *cancelbuffer; // stack of cleanup buffers

#ifdef CYGPKG_POSIX_SIGNALS
    sigset_t            sigpending;     // Set of pending signals
    sigset_t            sigmask;        // Thread's signal mask
#endif
    
    // The following is space for the eCos thread object that underlies
    // this POSIX thread. It is allocated like this to avoid constructing
    // it on startup.
    cyg_uint8           thread_obj[sizeof(Cyg_Thread)];

    // And the same for the joiner condition variable.
    cyg_uint8           joiner_obj[sizeof(Cyg_Condition_Variable)];

    // Per-thread data table pointer
    void                **thread_data;
    
} pthread_info;


// Values for the state field. These are solely concerned with the
// states visible to POSIX. The thread's run state is stored in the
// eCos thread object.
// Note: numerical order here is important, do not rearrange.

#define PTHREAD_STATE_FREE      0       // This structure is free for reuse
#define PTHREAD_STATE_DETACHED  1       // The thread is running but detached
#define PTHREAD_STATE_RUNNING   2       // The thread is running and will wait
                                        // to join when it exits
#define PTHREAD_STATE_JOIN      3       // The thread has exited and is waiting
                                        // to be joined
#define PTHREAD_STATE_EXITED    4       // The thread has exited and is ready to
                                        // be reaped
#endif // ifdef CYGPKG_POSIX_PTHREAD
//-----------------------------------------------------------------------------
// Internal definitions

// Handle entry to a pthread package function. 
#define PTHREAD_ENTRY() CYG_REPORT_FUNCTYPE( "returning %d" )

// Handle entry to a pthread package function with no args. 
#define PTHREAD_ENTRY_VOID() CYG_REPORT_FUNCTION()

// Do a pthread package defined return. This requires the error code to be
// returned as the result of the function. This also gives us a place to
// put any generic tidyup handling needed for things like signal delivery
// and cancellation.
#define PTHREAD_RETURN(err)                     \
CYG_MACRO_START                                 \
    CYG_REPORT_RETVAL( err );                   \
    return err;                                 \
CYG_MACRO_END

// A void variant of the above.
#define PTHREAD_RETURN_VOID                     \
CYG_MACRO_START                                 \
    CYG_REPORT_RETURN();                        \
    return;                                     \
CYG_MACRO_END

// Check that a pointer passed in as an argument is valid and return
// EINVAL if it is not. This should be used to check pointers that are
// required to be valid. Pointers that may optionally be NULL should
// be checked within the function.
#define PTHREAD_CHECK(ptr) if( (ptr) == NULL ) PTHREAD_RETURN(EINVAL);

#ifdef CYGPKG_POSIX_PTHREAD
# define PTHREAD_TESTCANCEL() pthread_testcancel()
#else
# define PTHREAD_TESTCANCEL()
#endif

//-----------------------------------------------------------------------------
// Priority translation.
// eCos priorities run from 0 as the highest to 31 as the lowest. POSIX priorities
// run in the opposite direction. The following macros translate between the two
// priority ranges.

#define PTHREAD_ECOS_PRIORITY(pri) (CYG_THREAD_MIN_PRIORITY-(pri))

#define PTHREAD_POSIX_PRIORITY(pri) (CYG_THREAD_MIN_PRIORITY-(pri))

//-----------------------------------------------------------------------------
// Global data structures

// Mutex for locking access to pthread_info structures
extern Cyg_Mutex pthread_mutex;

//-----------------------------------------------------------------------------
// Functions exported by pthread.cxx to the other parts of the POSIX subsystem.

#ifdef CYGPKG_POSIX_PTHREAD
externC void cyg_posix_pthread_start( void );

externC pthread_info *pthread_self_info(void);

externC pthread_info *pthread_info_id( pthread_t id );

# ifdef CYGPKG_POSIX_SIGNALS
externC void cyg_posix_pthread_release_thread( sigset_t *mask );
# endif
#endif

//-----------------------------------------------------------------------------
// Functions exported by signal.cxx to the other parts of the POSIX subsystem.

#ifdef CYGPKG_POSIX_SIGNALS
externC void cyg_posix_signal_start();

externC void cyg_posix_signal_asr(pthread_info *self);

externC cyg_bool cyg_sigqueue( const struct sigevent *sev, int code,
                               pthread_info *thread = NULL );

externC cyg_bool cyg_deliver_signals();

externC void cyg_posix_signal_sigwait();

externC void cyg_posix_thread_siginit( pthread_info *thread,
                                       pthread_info *parentthread );

externC void cyg_posix_thread_sigdestroy( pthread_info *thread );
#endif

//-----------------------------------------------------------------------------
// Functions exported by time.cxx to other parts of the POSIX subsystem.

#ifdef CYGPKG_POSIX_CLOCKS
externC void cyg_posix_clock_start();

externC cyg_tick_count cyg_timespec_to_ticks( const struct timespec *tp,
                                         cyg_bool roundup = false);

externC void cyg_ticks_to_timespec( cyg_tick_count ticks, struct timespec *tp );

#endif

#ifdef CYGPKG_POSIX_TIMERS

externC void cyg_posix_timer_asr( pthread_info *self );

#endif

//-----------------------------------------------------------------------------
// Functions exported by except.cxx

#ifdef CYGPKG_POSIX_SIGNALS
externC void cyg_posix_exception_start();

externC void cyg_pthread_exception_init(pthread_info *thread);

externC void cyg_pthread_exception_destroy(pthread_info *thread);
#endif

//-----------------------------------------------------------------------------
#endif // ifndef CYGONCE_PPRIVATE_H
// End of pprivate.h