1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 1998-2002
5 * Main function for a standalone Haskell program.
7 * ---------------------------------------------------------------------------*/
9 // PAPI uses caddr_t, which is not POSIX
10 // #include "PosixSource.h"
16 #include "OSThreads.h"
17 #include "Schedule.h" /* initScheduler */
18 #include "Stats.h" /* initStats */
19 #include "STM.h" /* initSTM */
21 #include "RtsSignals.h"
22 #include "ThrIOManager.h"
23 #include "Timer.h" /* startTimer, stopTimer */
27 #include "Prelude.h" /* fixupRTStoPreludeRefs */
30 #include "ThreadLabels.h"
31 #include "BlockAlloc.h"
33 #include "RtsTypeable.h"
38 #if defined(RTS_GTK_FRONTPANEL)
39 #include "FrontPanel.h"
42 # include "Profiling.h"
44 #if defined(PROFILING)
45 # include "ProfHeap.h"
46 # include "RetainerProfile.h"
50 # include "GranSimRts.h"
53 #if defined(GRAN) || defined(PAR)
54 # include "ParallelRts.h"
58 # include "Parallel.h"
62 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
63 #include "win32/AsyncIO.h"
82 // Count of how many outstanding hs_init()s there have been.
83 static int hs_init_count = 0;
85 // Here we save the terminal settings on the standard file
86 // descriptors, if we need to change them (eg. to support NoBuffering
88 static void *saved_termios[3] = {NULL,NULL,NULL};
91 __hscore_get_saved_termios(int fd)
93 return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
94 saved_termios[fd] : NULL;
98 __hscore_set_saved_termios(int fd, void* ts)
100 if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
101 saved_termios[fd] = ts;
105 /* -----------------------------------------------------------------------------
106 Initialise floating point unit on x86 (currently disabled. why?)
107 (see comment in ghc/compiler/nativeGen/MachInstrs.lhs).
108 -------------------------------------------------------------------------- */
110 #define X86_INIT_FPU 0
114 x86_init_fpu ( void )
116 __volatile unsigned short int fpu_cw;
118 // Grab the control word
119 __asm __volatile ("fnstcw %0" : "=m" (fpu_cw));
122 printf("fpu_cw: %x\n", fpu_cw);
125 // Set bits 8-9 to 10 (64-bit precision).
126 fpu_cw = (fpu_cw & 0xfcff) | 0x0200;
128 // Store the new control word back
129 __asm __volatile ("fldcw %0" : : "m" (fpu_cw));
133 /* -----------------------------------------------------------------------------
135 -------------------------------------------------------------------------- */
138 hs_init(int *argc, char **argv[])
141 if (hs_init_count > 1) {
142 // second and subsequent inits are ignored
146 /* Initialise the stats department, phase 0 */
149 /* Next we do is grab the start time...just in case we're
150 * collecting timing statistics.
155 /* Start off by initialising the allocator debugging so we can
162 * The parallel system needs to be initialised and synchronised before
163 * the program is run.
165 startupParallelSystem(argv);
167 if (*argv[0] == '-') { /* Strip off mainPE flag argument */
172 argv[1] = argv[0]; /* ignore the nPEs argument */
176 /* Set the RTS flags to default values. */
178 initRtsFlagsDefaults();
180 /* Call the user hook to reset defaults, if present */
183 /* Parse the flags, separating the RTS flags from the programs args */
184 if (argc != NULL && argv != NULL) {
185 setFullProgArgv(*argc,*argv);
186 setupRtsFlags(argc, *argv, &rts_argc, rts_argv);
187 setProgArgv(*argc,*argv);
190 /* Initialise the stats department, phase 1 */
197 /* initTracing must be after setupRtsFlags() */
201 /* NB: this really must be done after processing the RTS flags */
202 IF_PAR_DEBUG(verbose,
203 debugBelch("==== Synchronising system (%d PEs)\n", nPEs));
204 synchroniseSystem(); // calls initParallelSystem etc
207 /* initialise scheduler data structures (needs to be done before
213 /* And start GranSim profiling if required: */
214 if (RtsFlags.GranFlags.GranSimStats.Full)
215 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
217 /* And start GUM profiling if required: */
218 if (RtsFlags.ParFlags.ParStats.Full)
219 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
220 #endif /* PAR || GRAN */
222 /* initialize the storage manager */
225 /* initialise the stable pointer table */
226 initStablePtrTable();
228 /* initialise the shared Typeable store */
231 /* initialise file locking, if necessary */
232 #if !defined(mingw32_HOST_OS)
237 /* initialise thread label table (tso->char*) */
238 initThreadLabelTable();
243 /* start the virtual timer 'subsystem'. */
247 #if defined(RTS_USER_SIGNALS)
248 if (RtsFlags.MiscFlags.install_signal_handlers) {
249 /* Initialise the user signal handler set */
251 /* Set up handler to run on SIGINT, etc. */
252 initDefaultHandlers();
256 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
260 #ifdef RTS_GTK_FRONTPANEL
261 if (RtsFlags.GcFlags.frontpanel) {
270 /* Record initialization times */
274 // Compatibility interface
276 startupHaskell(int argc, char *argv[], void (*init_root)(void))
278 hs_init(&argc, &argv);
280 hs_add_root(init_root);
284 /* -----------------------------------------------------------------------------
285 Per-module initialisation
287 This process traverses all the compiled modules in the program
288 starting with "Main", and performing per-module initialisation for
291 So far, two things happen at initialisation time:
293 - we register stable names for each foreign-exported function
294 in that module. This prevents foreign-exported entities, and
295 things they depend on, from being garbage collected.
297 - we supply a unique integer to each statically declared cost
298 centre and cost centre stack in the program.
300 The code generator inserts a small function "__stginit_<module>" in each
301 module and calls the registration functions in each of the modules it
304 The init* functions are compiled in the same way as STG code,
305 i.e. without normal C call/return conventions. Hence we must use
306 StgRun to call this stuff.
307 -------------------------------------------------------------------------- */
309 /* The init functions use an explicit stack...
311 #define INIT_STACK_BLOCKS 4
312 static F_ *init_stack = NULL;
315 hs_add_root(void (*init_root)(void))
323 if (hs_init_count <= 0) {
324 barf("hs_add_root() must be called after hs_init()");
327 /* The initialisation stack grows downward, with sp pointing
328 to the last occupied word */
329 init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W;
330 bd = allocGroup_lock(INIT_STACK_BLOCKS);
331 init_stack = (F_ *)bd->start;
332 init_stack[--init_sp] = (F_)stg_init_finish;
333 if (init_root != NULL) {
334 init_stack[--init_sp] = (F_)init_root;
337 cap->r.rSp = (P_)(init_stack + init_sp);
338 StgRun((StgFunPtr)stg_init, &cap->r);
344 // This must be done after module initialisation.
345 // ToDo: make this work in the presence of multiple hs_add_root()s.
351 #if defined(THREADED_RTS)
356 /* ----------------------------------------------------------------------------
357 * Shutting down the RTS
359 * The wait_foreign parameter means:
360 * True ==> wait for any threads doing foreign calls now.
361 * False ==> threads doing foreign calls may return in the
362 * future, but will immediately block on a mutex.
363 * (capability->lock).
365 * If this RTS is a DLL that we're about to unload, then you want
366 * safe=True, otherwise the thread might return to code that has been
367 * unloaded. If this is a standalone program that is about to exit,
368 * then you can get away with safe=False, which is better because we
369 * won't hang on exit if there is a blocked foreign call outstanding.
371 ------------------------------------------------------------------------- */
374 hs_exit_(rtsBool wait_foreign)
376 if (hs_init_count <= 0) {
377 errorBelch("warning: too many hs_exit()s");
381 if (hs_init_count > 0) {
382 // ignore until it's the last one
386 /* start timing the shutdown */
391 #if defined(RTS_USER_SIGNALS)
392 if (RtsFlags.MiscFlags.install_signal_handlers) {
393 freeSignalHandlers();
397 #if defined(THREADED_RTS)
401 /* stop all running tasks */
402 exitScheduler(wait_foreign);
405 /* end_gr_simulation prints global stats if requested -- HWL */
406 if (!RtsFlags.GranFlags.GranSimStats.Suppressed)
410 /* stop the ticker */
414 /* reset the standard file descriptors to blocking mode */
415 resetNonBlockingFd(0);
416 resetNonBlockingFd(1);
417 resetNonBlockingFd(2);
420 // Reset the terminal settings on the standard file descriptors,
421 // if we changed them. See System.Posix.Internals.tcSetAttr for
422 // more details, including the reason we termporarily disable
426 sigset_t sigset, old_sigset;
427 sigemptyset(&sigset);
428 sigaddset(&sigset, SIGTTOU);
429 sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
430 for (fd = 0; fd <= 2; fd++) {
431 struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd);
433 tcsetattr(fd,TCSANOW,ts);
436 sigprocmask(SIG_SETMASK, &old_sigset, NULL);
441 /* controlled exit; good thread! */
442 shutdownParallelSystem(0);
444 /* global statistics in parallel system */
448 // uninstall signal handlers
449 resetDefaultHandlers();
451 /* stop timing the shutdown, we're about to print stats */
454 /* shutdown the hpc support (if needed) */
457 // clean up things from the storage manager's point of view.
458 // also outputs the stats (+RTS -s) info.
464 /* free shared Typeable store */
467 /* free file locking tables, if necessary */
468 #if !defined(mingw32_HOST_OS)
472 /* free the stable pointer table */
473 exitStablePtrTable();
476 /* free the thread label table */
477 freeThreadLabelTable();
480 #ifdef RTS_GTK_FRONTPANEL
481 if (RtsFlags.GcFlags.frontpanel) {
486 #if defined(PROFILING)
487 reportCCSProfiling();
494 // Originally, this was in report_ccs_profiling(). Now, retainer
495 // profiling might tack some extra stuff on to the end of this file
496 // during endProfiling().
497 if (prof_file != NULL) fclose(prof_file);
500 #if defined(TICKY_TICKY)
501 if (RtsFlags.TickyFlags.showTickyStats) PrintTickyInfo();
504 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
505 shutdownAsyncIO(wait_foreign);
508 /* free hash table storage */
511 // Finally, free all our storage
515 /* and shut down the allocator debugging */
521 // The real hs_exit():
526 // be safe; this might be a DLL
529 // Compatibility interfaces
531 shutdownHaskell(void)
537 shutdownHaskellAndExit(int n)
539 // we're about to exit(), no need to wait for foreign calls to return.
542 if (hs_init_count == 0) {
544 /* really exit (stg_exit() would call shutdownParallelSystem() again) */
552 #ifndef mingw32_HOST_OS
554 shutdownHaskellAndSignal(int sig)
562 * called from STG-land to exit the program
566 static int exit_started=rtsFalse;
569 void (*exitFn)(int) = 0;
575 /* HACK: avoid a loop when exiting due to a stupid error */
578 exit_started=rtsTrue;
580 IF_PAR_DEBUG(verbose, debugBelch("==-- stg_exit %d on [%x]...", n, mytid));
581 shutdownParallelSystem(n);