1 // bootstrap.cxx -- bootstrap routines: main()
3 // Written by Curtis Olson, started May 1997.
5 // Copyright (C) 1997 - 2002 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #if defined(__linux__) && defined(__i386__)
29 # include <fpu_control.h>
36 #include <simgear/compiler.h>
37 #include <simgear/structure/exception.hxx>
38 #include <simgear/debug/logstream.hxx>
45 #include "globals.hxx"
56 # include <console.h> // -dw- for command line dialog
59 char *homedir = ::getenv( "HOME" );
60 char *hostname = ::getenv( "HOSTNAME" );
61 bool free_hostname = false;
63 // foreward declaration.
66 #if defined(__linux__) && defined(__i386__)
68 static void handleFPE (int);
73 fpu_control_t fpe_flags = 0;
74 _FPU_GETCW(fpe_flags);
75 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
76 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
77 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
78 // fpe_flags &= ~_FPU_MASK_OM; // overflow
79 // fpe_flags &= ~_FPU_MASK_UM; // underflow
80 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
81 _FPU_SETCW(fpe_flags);
82 signal(SIGFPE, handleFPE);
89 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
102 short CPSGetCurrentProcess(PSN *psn);
103 short CPSSetProcessName (PSN *psn, char *processname);
104 short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
105 short CPSSetFrontProcess(PSN *psn);
108 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
113 int main ( int argc, char **argv );
114 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
115 LPSTR lpCmdLine, int nCmdShow) {
117 main( __argc, __argv );
123 #include <sys/sysmp.h>
127 * set the special "flush zero" bit (FS, bit 24) in the Control Status
128 * Register of the FPU of R4k and beyond so that the result of any
129 * underflowing operation will be clamped to zero, and no exception of
130 * any kind will be generated on the CPU. This has no effect on an
136 f.fc_word = get_fpc_csr();
137 f.fc_struct.flush = 1;
138 set_fpc_csr(f.fc_word);
142 int _bootstrap_OSInit;
144 // Main entry point; catch any exceptions that have made it this far.
145 int main ( int argc, char **argv ) {
147 _bootstrap_OSInit = 0;
149 // Enable floating-point exceptions for Linux/x86
150 #if defined(__linux__) && defined(__i386__)
157 // Bind all non-rendering threads to CPU1
158 // This will reduce the jitter caused by them to an absolute minimum,
159 // but it will only work with superuser authority.
160 if ( geteuid() == 0 )
162 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
163 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
164 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
168 // Enable floating-point exceptions for Windows
169 #if defined( _MSC_VER ) && defined( DEBUG )
170 // Christian, we should document what this does
171 _control87( _EM_INEXACT, _MCW_EM );
174 #if defined( HAVE_BC5PLUS )
175 _control87(MCW_EM, MCW_EM); /* defined in float.h */
178 // Keyboard focus hack
179 #if defined(__APPLE__) && !defined(OSX_BUNDLE)
183 fgOSInit (&argc, argv);
186 CPSGetCurrentProcess(&psn);
187 CPSSetProcessName(&psn, "FlightGear");
189 CPSSetFrontProcess(&psn);
193 // FIXME: add other, more specific
196 atexit(fgExitCleanup);
197 fgMainInit(argc, argv);
198 } catch (sg_throwable &t) {
199 // We must use cerr rather than
200 // logging, since logging may be
202 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
203 if (!t.getOrigin().empty())
204 cerr << " (received from " << t.getOrigin() << ')' << endl;
207 cerr << "Unknown exception in the main loop. Aborting..." << endl;
208 perror("Possible cause");
214 // do some clean up on exit. Specifically we want to call alutExit()
215 // which happens in the sound manager destructor.
216 void fgExitCleanup() {
218 if (_bootstrap_OSInit != 0)
219 fgSetMouseCursor(MOUSE_CURSOR_POINTER);
223 if (free_hostname && hostname != NULL)