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//===========================================================================
//
// signgam.cxx
//
// Support sign of the gamma*() functions in Math library
//
//===========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors: jlarmour
// Date: 1998-02-13
// Purpose:
// Description: Contains the accessor functions to get and set the stored sign
// of the gamma*() functions in the math library
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
// CONFIGURATION
#include <pkgconf/libm.h> // Configuration header
// Include the Math library?
#ifdef CYGPKG_LIBM
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common type definitions and support
#include <cyg/infra/cyg_trac.h> // Tracing macros
#include <math.h> // Main header for math library
#ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
# include <pkgconf/kernel.h> // Kernel configuration
# include <cyg/kernel/thread.hxx> // Kernel thread header
# include <cyg/kernel/thread.inl> // and its associated inlines
# include <cyg/kernel/mutex.hxx> // We need mutexes too
#endif
// GLOBAL VARIABLES
#ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
int signgam = 0;
#else // ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
static Cyg_Mutex cyg_libm_signgam_thread_data_index_mutex;
static cyg_count32 cyg_libm_signgam_thread_data_index = CYGNUM_KERNEL_THREADS_DATA_MAX;
# if defined(CYGDBG_USE_TRACING) && \
defined(CYGNUM_LIBM_SIGNGAM_TRACE_LEVEL)
static int libm_signgam_trace = CYGNUM_LIBM_SIGNGAM_TRACE_LEVEL;
# define TL1 (0 < libm_signgam_trace )
# else
# define TL1 (0)
# endif
#endif // ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
// FUNCTIONS
#ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
int *
cyg_libm_get_signgam_p( void )
{
Cyg_Thread *self = Cyg_Thread::self();
CYG_ADDRWORD *current_val_p;
CYG_REPORT_FUNCNAMETYPE( "Cyg_libm_get_signgam_p", "&signgam is %08x" );
// First check if this is the first thread to get here, and if so,
// initialise the thread data index
if (cyg_libm_signgam_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
{
CYG_TRACE0( TL1, "Index unset, locking mutex to allocate" );
// Lock mutex and then check again - less overhead for normal
// execution path
cyg_libm_signgam_thread_data_index_mutex.lock();
if (cyg_libm_signgam_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
{
CYG_TRACE0( TL1, "Allocating index" );
cyg_libm_signgam_thread_data_index = self->new_data_index();
} // if
cyg_libm_signgam_thread_data_index_mutex.unlock();
} // if
CYG_TRACE0( TL1, "Index set, now fetching per-thread data" );
// If we're here, then the index is set up
current_val_p = self->get_data_ptr( cyg_libm_signgam_thread_data_index );
CYG_REPORT_RETVAL( current_val_p );
return (int *) current_val_p;
} // cyg_libm_get_signgam_p()
#endif // ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
#endif // ifdef CYGPKG_LIBM
// EOF signgam.cxx
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