1 // -----------------------------------------------------------------------
2 // Copyright (C) 2006 - 2008 FRESCOR consortium partners:
4 // Universidad de Cantabria, SPAIN
5 // University of York, UK
6 // Scuola Superiore Sant'Anna, ITALY
7 // Kaiserslautern University, GERMANY
8 // Univ. Politécnica Valencia, SPAIN
9 // Czech Technical University in Prague, CZECH REPUBLIC
11 // Thales Communication S.A. FRANCE
12 // Visual Tools S.A. SPAIN
13 // Rapita Systems Ltd UK
16 // See http://www.frescor.org for a link to partners' websites
18 // FRESCOR project (FP6/2005/IST/5-034026) is funded
19 // in part by the European Union Sixth Framework Programme
20 // The European Union is not liable of any use that may be
24 // based on previous work (FSF) done in the FIRST project
26 // Copyright (C) 2005 Mälardalen University, SWEDEN
27 // Scuola Superiore S.Anna, ITALY
28 // Universidad de Cantabria, SPAIN
29 // University of York, UK
31 // FSF API web pages: http://marte.unican.es/fsf/docs
32 // http://shark.sssup.it/contrib/first/docs/
34 // This file is part of FOSA (Frsh Operating System Adaption)
36 // FOSA is free software; you can redistribute it and/or modify it
37 // under terms of the GNU General Public License as published by the
38 // Free Software Foundation; either version 2, or (at your option) any
39 // later version. FOSA is distributed in the hope that it will be
40 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty
41 // of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
42 // General Public License for more details. You should have received a
43 // copy of the GNU General Public License along with FOSA; see file
44 // COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,
45 // Cambridge, MA 02139, USA.
47 // As a special exception, including FOSA header files in a file,
48 // instantiating FOSA generics or templates, or linking other files
49 // with FOSA objects to produce an executable application, does not
50 // by itself cause the resulting executable application to be covered
51 // by the GNU General Public License. This exception does not
52 // however invalidate any other reasons why the executable file might be
53 // covered by the GNU Public License.
54 // -----------------------------------------------------------------------
56 //==============================================
57 // ******** ****** ******** **********
58 // **///// /** ** **////// /** /**
59 // ** /** ** /** /** /**
60 // ******* /** ** /********* /**********
61 // **//// /** ** ////////** /**//////**
62 // ** /** ** /** /** /**
63 // ** /** ** ******** /** /**
64 // // /******/ //////// // //
66 // FOSA(Frescor Operating System Adaptation layer)
67 //================================================
69 #ifdef CONFIG_LONGJUMP
71 #include <fosa_long_jump.h>
74 #define LONGJMP_MAGIC 0x01234567
75 pthread_t jmp_used_signals [LONGJMP_NSIG] = {[0 ... (LONGJMP_NSIG - 1)] = NULL};
76 pthread_mutex_t signal_pool_m = PTHREAD_MUTEX_INITIALIZER;
78 extern void fosa_longjmp (fosa_long_jump_context_t ctx, unsigned long magic);
80 int fosa_long_jump_was_performed
81 (const fosa_long_jump_context_t * context, int * jumped)
83 if (!context && !jumped)
86 *jumped = ((*(context))[6] == LONGJMP_MAGIC);
91 void jmp_handler (int signo, siginfo_t *info, void *context)
93 fosa_long_jump_context_t *jmp_info = (fosa_long_jump_context_t *) info -> si_value.sival_ptr;
97 // Restore the signal mask
98 s.sig = (*jmp_info)[7];
99 pthread_sigmask (SIG_SETMASK, &s, NULL);
101 #ifdef CONFIG_LONGJUMP_FREE_SIGNAL
106 sigaddset (&set, signo);
107 pthread_sigmask (SIG_BLOCK, &sigmask, NULL);
109 pthread_mutex_lock (&signal_pool_m);
110 jmp_used_signals [signo] = NULL;
111 pthread_mutex_unlock (&signal_pool_m);
114 // Restore the saved context
115 fosa_longjmp (*jmp_info, LONGJMP_MAGIC);
120 int fosa_long_jump_install_handler
121 (fosa_signal_t *signal, fosa_thread_id_t *handler)
127 // Check if current thread has a handler associated
128 for (i = 0; i < LONGJMP_NSIG; i ++)
129 if (jmp_used_signals [i] == pthread_self ()) {
130 sigemptyset (&sigmask);
131 sigaddset (&sigmask, LONGJMP_FIRSTSIG + i);
132 pthread_sigmask (SIG_UNBLOCK, &sigmask, NULL);
136 // Find the first usable signal
137 pthread_mutex_lock (&signal_pool_m);
138 for (i = 0; i < LONGJMP_NSIG && jmp_used_signals [i]; i++);
139 if (i >= LONGJMP_NSIG) {
140 pthread_mutex_unlock (&signal_pool_m);
144 jmp_used_signals [i] = pthread_self ();
145 pthread_mutex_unlock (&signal_pool_m);
147 *signal = LONGJMP_FIRSTSIG + i;
148 *handler = pthread_self ();
150 // intall the jump handler
151 sa.sa_flags = SA_SIGINFO;
152 sigfillset (&sa.sa_mask);
153 sa.sa_sigaction = jmp_handler;
154 sigaction (*signal, &sa, NULL);
156 // unmask the signal for the calling thread
157 sigemptyset (&sigmask);
158 sigaddset (&sigmask, *signal);
159 pthread_sigmask (SIG_UNBLOCK, &sigmask, NULL);
164 #endif /* CONFIG_LONGJUMP */