1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 1998-2002
5 * Main function for a standalone Haskell program.
7 * ---------------------------------------------------------------------------*/
9 #include "PosixSource.h"
14 #include "OSThreads.h"
15 #include "Storage.h" /* initStorage, exitStorage */
16 #include "Schedule.h" /* initScheduler */
17 #include "Stats.h" /* initStats */
18 #include "STM.h" /* initSTM */
20 #include "RtsSignals.h"
21 #include "Timer.h" /* startTimer, stopTimer */
25 #include "Prelude.h" /* fixupRTStoPreludeRefs */
28 #include "ThreadLabels.h"
29 #include "BlockAlloc.h"
31 #if defined(RTS_GTK_FRONTPANEL)
32 #include "FrontPanel.h"
35 #if defined(PROFILING) || defined(DEBUG)
36 # include "Profiling.h"
37 # include "ProfHeap.h"
38 # include "RetainerProfile.h"
42 # include "GranSimRts.h"
45 #if defined(GRAN) || defined(PAR)
46 # include "ParallelRts.h"
50 # include "Parallel.h"
54 #if defined(mingw32_HOST_OS)
55 #include "win32/AsyncIO.h"
67 // Count of how many outstanding hs_init()s there have been.
68 static int hs_init_count = 0;
70 // Here we save the terminal settings on the standard file
71 // descriptors, if we need to change them (eg. to support NoBuffering
73 static void *saved_termios[3] = {NULL,NULL,NULL};
76 __hscore_get_saved_termios(int fd)
78 return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
79 saved_termios[fd] : NULL;
83 __hscore_set_saved_termios(int fd, void* ts)
85 if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
86 saved_termios[fd] = ts;
90 /* -----------------------------------------------------------------------------
91 Initialise floating point unit on x86 (currently disabled. why?)
92 (see comment in ghc/compiler/nativeGen/MachInstrs.lhs).
93 -------------------------------------------------------------------------- */
95 #define X86_INIT_FPU 0
101 __volatile unsigned short int fpu_cw;
103 // Grab the control word
104 __asm __volatile ("fnstcw %0" : "=m" (fpu_cw));
107 printf("fpu_cw: %x\n", fpu_cw);
110 // Set bits 8-9 to 10 (64-bit precision).
111 fpu_cw = (fpu_cw & 0xfcff) | 0x0200;
113 // Store the new control word back
114 __asm __volatile ("fldcw %0" : : "m" (fpu_cw));
118 /* -----------------------------------------------------------------------------
120 -------------------------------------------------------------------------- */
123 hs_init(int *argc, char **argv[])
126 if (hs_init_count > 1) {
127 // second and subsequent inits are ignored
131 /* The very first thing we do is grab the start time...just in case we're
132 * collecting timing statistics.
138 * The parallel system needs to be initialised and synchronised before
139 * the program is run.
141 startupParallelSystem(argv);
143 if (*argv[0] == '-') { /* Strip off mainPE flag argument */
148 argv[1] = argv[0]; /* ignore the nPEs argument */
152 /* Set the RTS flags to default values. */
153 initRtsFlagsDefaults();
155 /* Call the user hook to reset defaults, if present */
158 /* Parse the flags, separating the RTS flags from the programs args */
159 if (argc != NULL && argv != NULL) {
160 setupRtsFlags(argc, *argv, &rts_argc, rts_argv);
161 setProgArgv(*argc,*argv);
165 /* NB: this really must be done after processing the RTS flags */
166 IF_PAR_DEBUG(verbose,
167 debugBelch("==== Synchronising system (%d PEs)\n", nPEs));
168 synchroniseSystem(); // calls initParallelSystem etc
171 /* Perform initialisation of adjustor thunk layer. */
174 /* initialise scheduler data structures (needs to be done before
180 /* And start GranSim profiling if required: */
181 if (RtsFlags.GranFlags.GranSimStats.Full)
182 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
184 /* And start GUM profiling if required: */
185 if (RtsFlags.ParFlags.ParStats.Full)
186 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
187 #endif /* PAR || GRAN */
189 /* initialize the storage manager */
192 /* initialise the stable pointer table */
193 initStablePtrTable();
196 /* initialise thread label table (tso->char*) */
197 initThreadLabelTable();
200 #if defined(PROFILING) || defined(DEBUG)
204 /* start the virtual timer 'subsystem'. */
205 startTimer(TICK_MILLISECS);
207 /* Initialise the stats department */
210 #if defined(RTS_USER_SIGNALS)
211 /* Initialise the user signal handler set */
213 /* Set up handler to run on SIGINT, etc. */
214 initDefaultHandlers();
217 #if defined(mingw32_HOST_OS)
221 #ifdef RTS_GTK_FRONTPANEL
222 if (RtsFlags.GcFlags.frontpanel) {
231 #if defined(THREADED_RTS) && !defined(mingw32_HOST_OS)
235 /* Record initialization times */
239 // Compatibility interface
241 startupHaskell(int argc, char *argv[], void (*init_root)(void))
243 hs_init(&argc, &argv);
245 hs_add_root(init_root);
249 /* -----------------------------------------------------------------------------
250 Per-module initialisation
252 This process traverses all the compiled modules in the program
253 starting with "Main", and performing per-module initialisation for
256 So far, two things happen at initialisation time:
258 - we register stable names for each foreign-exported function
259 in that module. This prevents foreign-exported entities, and
260 things they depend on, from being garbage collected.
262 - we supply a unique integer to each statically declared cost
263 centre and cost centre stack in the program.
265 The code generator inserts a small function "__stginit_<module>" in each
266 module and calls the registration functions in each of the modules it
269 The init* functions are compiled in the same way as STG code,
270 i.e. without normal C call/return conventions. Hence we must use
271 StgRun to call this stuff.
272 -------------------------------------------------------------------------- */
274 /* The init functions use an explicit stack...
276 #define INIT_STACK_BLOCKS 4
277 static F_ *init_stack = NULL;
280 hs_add_root(void (*init_root)(void))
284 Capability *cap = &MainCapability;
286 if (hs_init_count <= 0) {
287 barf("hs_add_root() must be called after hs_init()");
290 /* The initialisation stack grows downward, with sp pointing
291 to the last occupied word */
292 init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W;
293 bd = allocGroup_lock(INIT_STACK_BLOCKS);
294 init_stack = (F_ *)bd->start;
295 init_stack[--init_sp] = (F_)stg_init_finish;
296 if (init_root != NULL) {
297 init_stack[--init_sp] = (F_)init_root;
300 cap->r.rSp = (P_)(init_stack + init_sp);
301 StgRun((StgFunPtr)stg_init, &cap->r);
305 #if defined(PROFILING) || defined(DEBUG)
306 // This must be done after module initialisation.
307 // ToDo: make this work in the presence of multiple hs_add_root()s.
312 /* -----------------------------------------------------------------------------
313 Shutting down the RTS
314 -------------------------------------------------------------------------- */
319 if (hs_init_count <= 0) {
320 errorBelch("warning: too many hs_exit()s");
324 if (hs_init_count > 0) {
325 // ignore until it's the last one
329 /* start timing the shutdown */
332 #if defined(THREADED_RTS) && !defined(mingw32_HOST_OS)
336 /* stop all running tasks */
340 /* end_gr_simulation prints global stats if requested -- HWL */
341 if (!RtsFlags.GranFlags.GranSimStats.Suppressed)
345 /* stop the ticker */
348 /* reset the standard file descriptors to blocking mode */
349 resetNonBlockingFd(0);
350 resetNonBlockingFd(1);
351 resetNonBlockingFd(2);
354 // Reset the terminal settings on the standard file descriptors,
355 // if we changed them. See System.Posix.Internals.tcSetAttr for
356 // more details, including the reason we termporarily disable
360 sigset_t sigset, old_sigset;
361 sigemptyset(&sigset);
362 sigaddset(&sigset, SIGTTOU);
363 sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
364 for (fd = 0; fd <= 2; fd++) {
365 struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd);
367 tcsetattr(fd,TCSANOW,ts);
370 sigprocmask(SIG_SETMASK, &old_sigset, NULL);
375 /* controlled exit; good thread! */
376 shutdownParallelSystem(0);
378 /* global statistics in parallel system */
382 /* stop timing the shutdown, we're about to print stats */
385 // clean up things from the storage manager's point of view.
386 // also outputs the stats (+RTS -s) info.
389 #ifdef RTS_GTK_FRONTPANEL
390 if (RtsFlags.GcFlags.frontpanel) {
395 #if defined(PROFILING)
396 reportCCSProfiling();
399 #if defined(PROFILING) || defined(DEBUG)
404 // Originally, this was in report_ccs_profiling(). Now, retainer
405 // profiling might tack some extra stuff on to the end of this file
406 // during endProfiling().
410 #if defined(TICKY_TICKY)
411 if (RtsFlags.TickyFlags.showTickyStats) PrintTickyInfo();
414 #if defined(mingw32_HOST_OS)
418 // Finally, free all our storage.
422 // Compatibility interfaces
424 shutdownHaskell(void)
430 shutdownHaskellAndExit(int n)
432 if (hs_init_count == 1) {
436 /* really exit (stg_exit() would call shutdownParallelSystem() again) */
445 * called from STG-land to exit the program
449 static int exit_started=rtsFalse;
456 /* HACK: avoid a loop when exiting due to a stupid error */
459 exit_started=rtsTrue;
461 IF_PAR_DEBUG(verbose, debugBelch("==-- stg_exit %d on [%x]...", n, mytid));
462 shutdownParallelSystem(n);