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43 lines
1.7 KiB
C
43 lines
1.7 KiB
C
/* -*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*- */
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/* vim: set filetype=c tabstop=8 shiftwidth=4 expandtab: */
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/*
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internal.h -- safe stack resizing
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*/
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/*
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Copyright (c) 2001, Juan Jose Garcia Ripoll.
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ECL is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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See file '../Copyright' for full details.
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*/
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#ifndef ECL_STACK_RESIZE_H
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#define ECL_STACK_RESIZE_H
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/* We can't block interrupts with ecl_disable_interrupts() and write
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* in the thread local environment if we use fast interrupt dispatch
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* via mprotect(), so we have to use sigprocmask instead. No
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* performance problems, since this is only used for stack
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* resizing. */
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#if defined(ECL_THREADS) && defined(ECL_USE_MPROTECT)
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# ifdef HAVE_SIGPROCMASK
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# include <signal.h>
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# define ECL_STACK_RESIZE_DISABLE_INTERRUPTS(the_env) \
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sigset_t __sigset_new, __sigset_previous; \
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sigfillset(&__sigset_new); \
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pthread_sigmask(SIG_BLOCK, &__sigset_new, &__sigset_previous)
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# define ECL_STACK_RESIZE_ENABLE_INTERRUPTS(the_env) \
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pthread_sigmask(SIG_SETMASK, &__sigset_previous, NULL)
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# else
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# error "Can't protect stack resizing from interrupts without sigprocmask. Either build ECL without mprotect() or live with possible race conditions."
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# endif /* HAVE_SIGPROCMASK */
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#else
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# define ECL_STACK_RESIZE_DISABLE_INTERRUPTS(the_env) ecl_disable_interrupts_env(the_env);
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# define ECL_STACK_RESIZE_ENABLE_INTERRUPTS(the_env) ecl_enable_interrupts_env(env);
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# endif /* ECL_THREADS && ECL_USE_MPROTECT */
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#endif /* ECL_STACK_RESIZE_H */
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