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"
37 #if defined(RTS_GTK_FRONTPANEL)
38 #include "FrontPanel.h"
41 # include "Profiling.h"
43 #if defined(PROFILING)
44 # include "ProfHeap.h"
45 # include "RetainerProfile.h"
49 # include "GranSimRts.h"
52 #if defined(GRAN) || defined(PAR)
53 # include "ParallelRts.h"
57 # include "Parallel.h"
61 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
62 #include "win32/AsyncIO.h"
78 // Count of how many outstanding hs_init()s there have been.
79 static int hs_init_count = 0;
81 // Here we save the terminal settings on the standard file
82 // descriptors, if we need to change them (eg. to support NoBuffering
84 static void *saved_termios[3] = {NULL,NULL,NULL};
87 __hscore_get_saved_termios(int fd)
89 return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
90 saved_termios[fd] : NULL;
94 __hscore_set_saved_termios(int fd, void* ts)
96 if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
97 saved_termios[fd] = ts;
101 /* -----------------------------------------------------------------------------
102 Initialise floating point unit on x86 (currently disabled. why?)
103 (see comment in ghc/compiler/nativeGen/MachInstrs.lhs).
104 -------------------------------------------------------------------------- */
106 #define X86_INIT_FPU 0
110 x86_init_fpu ( void )
112 __volatile unsigned short int fpu_cw;
114 // Grab the control word
115 __asm __volatile ("fnstcw %0" : "=m" (fpu_cw));
118 printf("fpu_cw: %x\n", fpu_cw);
121 // Set bits 8-9 to 10 (64-bit precision).
122 fpu_cw = (fpu_cw & 0xfcff) | 0x0200;
124 // Store the new control word back
125 __asm __volatile ("fldcw %0" : : "m" (fpu_cw));
129 /* -----------------------------------------------------------------------------
131 -------------------------------------------------------------------------- */
134 hs_init(int *argc, char **argv[])
137 if (hs_init_count > 1) {
138 // second and subsequent inits are ignored
143 /* Start off by initialising the allocator debugging so we can
148 /* Next we do is grab the start time...just in case we're
149 * collecting timing statistics.
155 * The parallel system needs to be initialised and synchronised before
156 * the program is run.
158 startupParallelSystem(argv);
160 if (*argv[0] == '-') { /* Strip off mainPE flag argument */
165 argv[1] = argv[0]; /* ignore the nPEs argument */
169 /* Initialise the performance tracking library */
173 if ((ver = PAPI_library_init(PAPI_VER_CURRENT)) != PAPI_VER_CURRENT) {
175 errorBelch("PAPI_library_init: wrong version: %x", ver);
176 stg_exit(EXIT_FAILURE);
178 sysErrorBelch("PAPI_library_init");
179 stg_exit(EXIT_FAILURE);
186 if ((err = PAPI_thread_init(osThreadId)) < 0) {
187 barf("PAPI_thread_init: %d",err);
193 /* Set the RTS flags to default values. */
195 initRtsFlagsDefaults();
197 /* Call the user hook to reset defaults, if present */
200 /* Parse the flags, separating the RTS flags from the programs args */
201 if (argc != NULL && argv != NULL) {
202 setupRtsFlags(argc, *argv, &rts_argc, rts_argv);
203 setProgArgv(*argc,*argv);
206 /* initTracing must be after setupRtsFlags() */
210 /* NB: this really must be done after processing the RTS flags */
211 IF_PAR_DEBUG(verbose,
212 debugBelch("==== Synchronising system (%d PEs)\n", nPEs));
213 synchroniseSystem(); // calls initParallelSystem etc
216 /* initialise scheduler data structures (needs to be done before
222 /* And start GranSim profiling if required: */
223 if (RtsFlags.GranFlags.GranSimStats.Full)
224 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
226 /* And start GUM profiling if required: */
227 if (RtsFlags.ParFlags.ParStats.Full)
228 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
229 #endif /* PAR || GRAN */
231 /* initialize the storage manager */
234 /* initialise the stable pointer table */
235 initStablePtrTable();
237 /* initialise the shared Typeable store */
241 /* initialise thread label table (tso->char*) */
242 initThreadLabelTable();
247 /* start the virtual timer 'subsystem'. */
250 /* Initialise the stats department */
253 #if defined(RTS_USER_SIGNALS)
254 if (RtsFlags.MiscFlags.install_signal_handlers) {
255 /* Initialise the user signal handler set */
257 /* Set up handler to run on SIGINT, etc. */
258 initDefaultHandlers();
262 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
266 #ifdef RTS_GTK_FRONTPANEL
267 if (RtsFlags.GcFlags.frontpanel) {
276 #if defined(THREADED_RTS)
280 /* Record initialization times */
284 // Compatibility interface
286 startupHaskell(int argc, char *argv[], void (*init_root)(void))
288 hs_init(&argc, &argv);
290 hs_add_root(init_root);
294 /* -----------------------------------------------------------------------------
295 Per-module initialisation
297 This process traverses all the compiled modules in the program
298 starting with "Main", and performing per-module initialisation for
301 So far, two things happen at initialisation time:
303 - we register stable names for each foreign-exported function
304 in that module. This prevents foreign-exported entities, and
305 things they depend on, from being garbage collected.
307 - we supply a unique integer to each statically declared cost
308 centre and cost centre stack in the program.
310 The code generator inserts a small function "__stginit_<module>" in each
311 module and calls the registration functions in each of the modules it
314 The init* functions are compiled in the same way as STG code,
315 i.e. without normal C call/return conventions. Hence we must use
316 StgRun to call this stuff.
317 -------------------------------------------------------------------------- */
319 /* The init functions use an explicit stack...
321 #define INIT_STACK_BLOCKS 4
322 static F_ *init_stack = NULL;
325 hs_add_root(void (*init_root)(void))
329 Capability *cap = &MainCapability;
331 if (hs_init_count <= 0) {
332 barf("hs_add_root() must be called after hs_init()");
335 /* The initialisation stack grows downward, with sp pointing
336 to the last occupied word */
337 init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W;
338 bd = allocGroup_lock(INIT_STACK_BLOCKS);
339 init_stack = (F_ *)bd->start;
340 init_stack[--init_sp] = (F_)stg_init_finish;
341 if (init_root != NULL) {
342 init_stack[--init_sp] = (F_)init_root;
345 cap->r.rSp = (P_)(init_stack + init_sp);
346 StgRun((StgFunPtr)stg_init, &cap->r);
352 // This must be done after module initialisation.
353 // ToDo: make this work in the presence of multiple hs_add_root()s.
357 /* -----------------------------------------------------------------------------
358 Shutting down the RTS
359 -------------------------------------------------------------------------- */
364 if (hs_init_count <= 0) {
365 errorBelch("warning: too many hs_exit()s");
369 if (hs_init_count > 0) {
370 // ignore until it's the last one
374 /* start timing the shutdown */
377 #if defined(RTS_USER_SIGNALS)
378 if (RtsFlags.MiscFlags.install_signal_handlers) {
379 freeSignalHandlers();
383 #if defined(THREADED_RTS)
387 /* stop all running tasks */
391 /* end_gr_simulation prints global stats if requested -- HWL */
392 if (!RtsFlags.GranFlags.GranSimStats.Suppressed)
396 /* stop the ticker */
399 /* reset the standard file descriptors to blocking mode */
400 resetNonBlockingFd(0);
401 resetNonBlockingFd(1);
402 resetNonBlockingFd(2);
405 // Reset the terminal settings on the standard file descriptors,
406 // if we changed them. See System.Posix.Internals.tcSetAttr for
407 // more details, including the reason we termporarily disable
411 sigset_t sigset, old_sigset;
412 sigemptyset(&sigset);
413 sigaddset(&sigset, SIGTTOU);
414 sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
415 for (fd = 0; fd <= 2; fd++) {
416 struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd);
418 tcsetattr(fd,TCSANOW,ts);
421 sigprocmask(SIG_SETMASK, &old_sigset, NULL);
426 /* controlled exit; good thread! */
427 shutdownParallelSystem(0);
429 /* global statistics in parallel system */
433 /* stop timing the shutdown, we're about to print stats */
436 /* shutdown the hpc support (if needed) */
439 // clean up things from the storage manager's point of view.
440 // also outputs the stats (+RTS -s) info.
446 /* free shared Typeable store */
449 /* free the stable pointer table */
450 exitStablePtrTable();
455 /* free the thread label table */
456 freeThreadLabelTable();
459 #ifdef RTS_GTK_FRONTPANEL
460 if (RtsFlags.GcFlags.frontpanel) {
465 #if defined(PROFILING)
466 reportCCSProfiling();
472 // Originally, this was in report_ccs_profiling(). Now, retainer
473 // profiling might tack some extra stuff on to the end of this file
474 // during endProfiling().
478 #if defined(TICKY_TICKY)
479 if (RtsFlags.TickyFlags.showTickyStats) PrintTickyInfo();
482 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
486 /* free hash table storage */
489 // Finally, free all our storage
493 /* and shut down the allocator debugging */
499 // Compatibility interfaces
501 shutdownHaskell(void)
507 shutdownHaskellAndExit(int n)
509 if (hs_init_count == 1) {
513 /* really exit (stg_exit() would call shutdownParallelSystem() again) */
522 * called from STG-land to exit the program
526 static int exit_started=rtsFalse;
529 void (*exitFn)(int) = 0;
535 /* HACK: avoid a loop when exiting due to a stupid error */
538 exit_started=rtsTrue;
540 IF_PAR_DEBUG(verbose, debugBelch("==-- stg_exit %d on [%x]...", n, mytid));
541 shutdownParallelSystem(n);