edee9b6a12
Because a thread calling IO#close now blocks in a native condvar wait, it's possible for there to be _no_ threads left to actually handle incoming signals/ubf calls/etc. This manifested as failing tests on Solaris 10 (SPARC), because: * One thread called IO#close, which sent a SIGVTALRM to the other thread to interrupt it, and then waited on the condvar to be notified that the reading thread was done. * One thread was calling IO#read, but it hadn't yet reached the actual call to select(2) when the SIGVTALRM arrived, so it never unblocked itself. This results in a deadlock. The fix is to use a real Ruby mutex for the close lock; that way, the closing thread goes into sigwait-sleep and can keep trying to interrupt the select(2) thread. See the discussion in: https://github.com/ruby/ruby/pull/7865/
75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
#ifndef INTERNAL_THREAD_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_THREAD_H
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/**
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @brief Internal header for Thread.
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*/
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#include "ruby/ruby.h" /* for VALUE */
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#include "ruby/intern.h" /* for rb_blocking_function_t */
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#include "ccan/list/list.h" /* for list in rb_io_close_wait_list */
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struct rb_thread_struct; /* in vm_core.h */
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#define RB_VM_SAVE_MACHINE_CONTEXT(th) \
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do { \
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FLUSH_REGISTER_WINDOWS; \
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setjmp((th)->ec->machine.regs); \
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SET_MACHINE_STACK_END(&(th)->ec->machine.stack_end); \
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} while (0)
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/* thread.c */
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#define COVERAGE_INDEX_LINES 0
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#define COVERAGE_INDEX_BRANCHES 1
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#define COVERAGE_TARGET_LINES 1
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#define COVERAGE_TARGET_BRANCHES 2
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#define COVERAGE_TARGET_METHODS 4
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#define COVERAGE_TARGET_ONESHOT_LINES 8
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#define COVERAGE_TARGET_EVAL 16
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#define RUBY_FATAL_THREAD_KILLED INT2FIX(0)
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#define RUBY_FATAL_THREAD_TERMINATED INT2FIX(1)
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#define RUBY_FATAL_FIBER_KILLED RB_INT2FIX(2)
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VALUE rb_obj_is_mutex(VALUE obj);
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VALUE rb_suppress_tracing(VALUE (*func)(VALUE), VALUE arg);
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void rb_thread_execute_interrupts(VALUE th);
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VALUE rb_get_coverages(void);
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int rb_get_coverage_mode(void);
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VALUE rb_default_coverage(int);
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VALUE rb_thread_shield_new(void);
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bool rb_thread_shield_owned(VALUE self);
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VALUE rb_thread_shield_wait(VALUE self);
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VALUE rb_thread_shield_release(VALUE self);
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VALUE rb_thread_shield_destroy(VALUE self);
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int rb_thread_to_be_killed(VALUE thread);
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void rb_mutex_allow_trap(VALUE self, int val);
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VALUE rb_uninterruptible(VALUE (*b_proc)(VALUE), VALUE data);
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VALUE rb_mutex_owned_p(VALUE self);
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VALUE rb_exec_recursive_outer_mid(VALUE (*f)(VALUE g, VALUE h, int r), VALUE g, VALUE h, ID mid);
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int rb_thread_wait_for_single_fd(int fd, int events, struct timeval * timeout);
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struct rb_io_close_wait_list {
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struct ccan_list_head pending_fd_users;
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VALUE closing_thread;
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VALUE wakeup_mutex;
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};
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int rb_notify_fd_close(int fd, struct rb_io_close_wait_list *busy);
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void rb_notify_fd_close_wait(struct rb_io_close_wait_list *busy);
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RUBY_SYMBOL_EXPORT_BEGIN
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/* Temporary. This API will be removed (renamed). */
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VALUE rb_thread_io_blocking_region(rb_blocking_function_t *func, void *data1, int fd);
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/* thread.c (export) */
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int ruby_thread_has_gvl_p(void); /* for ext/fiddle/closure.c */
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RUBY_SYMBOL_EXPORT_END
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int rb_threadptr_execute_interrupts(struct rb_thread_struct *th, int blocking_timing);
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#endif /* INTERNAL_THREAD_H */
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