//===========================================================================
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//===========================================================================
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//
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//
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// signgam.cxx
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// signgam.cxx
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//
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//
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// Support sign of the gamma*() functions in Math library
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// Support sign of the gamma*() functions in Math library
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//
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//
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//===========================================================================
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//===========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//####ECOSGPLCOPYRIGHTEND####
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//===========================================================================
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//===========================================================================
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//#####DESCRIPTIONBEGIN####
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//#####DESCRIPTIONBEGIN####
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//
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//
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// Author(s): jlarmour
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// Author(s): jlarmour
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// Contributors: jlarmour
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// Contributors: jlarmour
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// Date: 1998-02-13
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// Date: 1998-02-13
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// Purpose:
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// Purpose:
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// Description: Contains the accessor functions to get and set the stored sign
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// Description: Contains the accessor functions to get and set the stored sign
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// of the gamma*() functions in the math library
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// of the gamma*() functions in the math library
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// Usage:
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// Usage:
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//
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//
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//####DESCRIPTIONEND####
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//####DESCRIPTIONEND####
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//
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//
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//===========================================================================
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//===========================================================================
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// CONFIGURATION
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// CONFIGURATION
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#include <pkgconf/libm.h> // Configuration header
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#include <pkgconf/libm.h> // Configuration header
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// Include the Math library?
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// Include the Math library?
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#ifdef CYGPKG_LIBM
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#ifdef CYGPKG_LIBM
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// INCLUDES
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// INCLUDES
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#include <cyg/infra/cyg_type.h> // Common type definitions and support
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#include <cyg/infra/cyg_type.h> // Common type definitions and support
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#include <cyg/infra/cyg_trac.h> // Tracing macros
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#include <cyg/infra/cyg_trac.h> // Tracing macros
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#include <math.h> // Main header for math library
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#include <math.h> // Main header for math library
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#ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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#ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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# include <pkgconf/kernel.h> // Kernel configuration
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# include <pkgconf/kernel.h> // Kernel configuration
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# include <cyg/kernel/thread.hxx> // Kernel thread header
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# include <cyg/kernel/thread.hxx> // Kernel thread header
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# include <cyg/kernel/thread.inl> // and its associated inlines
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# include <cyg/kernel/thread.inl> // and its associated inlines
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# include <cyg/kernel/mutex.hxx> // We need mutexes too
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# include <cyg/kernel/mutex.hxx> // We need mutexes too
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#endif
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#endif
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// GLOBAL VARIABLES
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// GLOBAL VARIABLES
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#ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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#ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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int signgam = 0;
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int signgam = 0;
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#else // ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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#else // ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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static Cyg_Mutex cyg_libm_signgam_thread_data_index_mutex;
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static Cyg_Mutex cyg_libm_signgam_thread_data_index_mutex;
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static cyg_count32 cyg_libm_signgam_thread_data_index = CYGNUM_KERNEL_THREADS_DATA_MAX;
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static cyg_count32 cyg_libm_signgam_thread_data_index = CYGNUM_KERNEL_THREADS_DATA_MAX;
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# if defined(CYGDBG_USE_TRACING) && \
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# if defined(CYGDBG_USE_TRACING) && \
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defined(CYGNUM_LIBM_SIGNGAM_TRACE_LEVEL)
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defined(CYGNUM_LIBM_SIGNGAM_TRACE_LEVEL)
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static int libm_signgam_trace = CYGNUM_LIBM_SIGNGAM_TRACE_LEVEL;
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static int libm_signgam_trace = CYGNUM_LIBM_SIGNGAM_TRACE_LEVEL;
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# define TL1 (0 < libm_signgam_trace )
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# define TL1 (0 < libm_signgam_trace )
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# else
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# else
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# define TL1 (0)
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# define TL1 (0)
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# endif
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# endif
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#endif // ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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#endif // ifndef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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// FUNCTIONS
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// FUNCTIONS
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#ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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#ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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int *
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int *
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cyg_libm_get_signgam_p( void )
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cyg_libm_get_signgam_p( void )
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{
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{
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Cyg_Thread *self = Cyg_Thread::self();
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Cyg_Thread *self = Cyg_Thread::self();
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CYG_ADDRWORD *current_val_p;
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CYG_ADDRWORD *current_val_p;
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CYG_REPORT_FUNCNAMETYPE( "Cyg_libm_get_signgam_p", "&signgam is %08x" );
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CYG_REPORT_FUNCNAMETYPE( "Cyg_libm_get_signgam_p", "&signgam is %08x" );
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// First check if this is the first thread to get here, and if so,
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// First check if this is the first thread to get here, and if so,
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// initialise the thread data index
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// initialise the thread data index
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if (cyg_libm_signgam_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
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if (cyg_libm_signgam_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
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{
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{
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CYG_TRACE0( TL1, "Index unset, locking mutex to allocate" );
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CYG_TRACE0( TL1, "Index unset, locking mutex to allocate" );
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// Lock mutex and then check again - less overhead for normal
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// Lock mutex and then check again - less overhead for normal
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// execution path
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// execution path
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cyg_libm_signgam_thread_data_index_mutex.lock();
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cyg_libm_signgam_thread_data_index_mutex.lock();
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if (cyg_libm_signgam_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
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if (cyg_libm_signgam_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
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{
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{
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CYG_TRACE0( TL1, "Allocating index" );
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CYG_TRACE0( TL1, "Allocating index" );
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cyg_libm_signgam_thread_data_index = self->new_data_index();
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cyg_libm_signgam_thread_data_index = self->new_data_index();
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} // if
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} // if
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cyg_libm_signgam_thread_data_index_mutex.unlock();
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cyg_libm_signgam_thread_data_index_mutex.unlock();
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} // if
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} // if
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CYG_TRACE0( TL1, "Index set, now fetching per-thread data" );
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CYG_TRACE0( TL1, "Index set, now fetching per-thread data" );
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// If we're here, then the index is set up
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// If we're here, then the index is set up
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current_val_p = self->get_data_ptr( cyg_libm_signgam_thread_data_index );
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current_val_p = self->get_data_ptr( cyg_libm_signgam_thread_data_index );
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CYG_REPORT_RETVAL( current_val_p );
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CYG_REPORT_RETVAL( current_val_p );
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return (int *) current_val_p;
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return (int *) current_val_p;
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} // cyg_libm_get_signgam_p()
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} // cyg_libm_get_signgam_p()
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#endif // ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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#endif // ifdef CYGSEM_LIBM_THREAD_SAFE_GAMMA_FUNCTIONS
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#endif // ifdef CYGPKG_LIBM
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#endif // ifdef CYGPKG_LIBM
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// EOF signgam.cxx
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// EOF signgam.cxx
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