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f11db2a605
A doubly-linked list for tracking living threads guarantees constant-time insert/delete performance with no corner cases of a hash table. I chose this ccan implementation of doubly-linked lists over the BSD sys/queue.h implementation since: 1) insertion and removal are both branchless 2) locality is improved if a struct may be a member of multiple lists (0002 patch in Feature 9632 will introduce a secondary list for waiting FDs) This also increases cache locality during iteration: improving performance in a new IO#close benchmark with many sleeping threads while still scanning the same number of threads. vm_thread_close 1.762 * vm_core.h (rb_vm_t): list_head and counter for living_threads (rb_thread_t): vmlt_node for living_threads linkage (rb_vm_living_threads_init): new function wrapper (rb_vm_living_threads_insert): ditto (rb_vm_living_threads_remove): ditto * vm.c (rb_vm_living_threads_foreach): new function wrapper * thread.c (terminate_i, thread_start_func_2, thread_create_core, thread_fd_close_i, thread_fd_close): update to use new APIs * vm.c (vm_mark_each_thread_func, rb_vm_mark, ruby_vm_destruct, vm_memsize, vm_init2, Init_VM): ditto * vm_trace.c (clear_trace_func_i, rb_clear_trace_func): ditto * benchmark/bm_vm_thread_close.rb: added to show improvement * ccan/build_assert/build_assert.h: added as a dependency of list.h * ccan/check_type/check_type.h: ditto * ccan/container_of/container_of.h: ditto * ccan/licenses/BSD-MIT: ditto * ccan/licenses/CC0: ditto * ccan/str/str.h: ditto (stripped of unused macros) * ccan/list/list.h: ditto * common.mk: add CCAN_LIST_INCLUDES [ruby-core:61871][Feature 9632 (part 1)] Apologies for the size of this commit, but I think a good doubly-linked list will be useful for future features, too. This may be used to add ordering to a container_of-based hash table to preserve compatibility if required (e.g. feature 9614). git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
106 lines
3 KiB
C
106 lines
3 KiB
C
/* CC0 (Public domain) - see ccan/licenses/CC0 file for details */
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#ifndef CCAN_CONTAINER_OF_H
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#define CCAN_CONTAINER_OF_H
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#include "ccan/check_type/check_type.h"
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/**
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* container_of - get pointer to enclosing structure
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* @member_ptr: pointer to the structure member
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* @containing_type: the type this member is within
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* @member: the name of this member within the structure.
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*
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* Given a pointer to a member of a structure, this macro does pointer
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* subtraction to return the pointer to the enclosing type.
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*
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* Example:
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* struct foo {
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* int fielda, fieldb;
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* // ...
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* };
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* struct info {
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* int some_other_field;
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* struct foo my_foo;
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* };
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*
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* static struct info *foo_to_info(struct foo *foo)
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* {
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* return container_of(foo, struct info, my_foo);
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* }
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*/
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#define container_of(member_ptr, containing_type, member) \
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((containing_type *) \
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((char *)(member_ptr) \
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- container_off(containing_type, member)) \
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+ check_types_match(*(member_ptr), ((containing_type *)0)->member))
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/**
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* container_off - get offset to enclosing structure
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* @containing_type: the type this member is within
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* @member: the name of this member within the structure.
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*
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* Given a pointer to a member of a structure, this macro does
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* typechecking and figures out the offset to the enclosing type.
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*
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* Example:
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* struct foo {
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* int fielda, fieldb;
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* // ...
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* };
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* struct info {
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* int some_other_field;
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* struct foo my_foo;
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* };
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*
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* static struct info *foo_to_info(struct foo *foo)
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* {
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* size_t off = container_off(struct info, my_foo);
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* return (void *)((char *)foo - off);
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* }
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*/
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#define container_off(containing_type, member) \
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offsetof(containing_type, member)
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/**
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* container_of_var - get pointer to enclosing structure using a variable
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* @member_ptr: pointer to the structure member
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* @container_var: a pointer of same type as this member's container
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* @member: the name of this member within the structure.
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*
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* Given a pointer to a member of a structure, this macro does pointer
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* subtraction to return the pointer to the enclosing type.
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*
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* Example:
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* static struct info *foo_to_i(struct foo *foo)
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* {
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* struct info *i = container_of_var(foo, i, my_foo);
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* return i;
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* }
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*/
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#if HAVE_TYPEOF
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#define container_of_var(member_ptr, container_var, member) \
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container_of(member_ptr, typeof(*container_var), member)
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#else
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#define container_of_var(member_ptr, container_var, member) \
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((void *)((char *)(member_ptr) - \
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container_off_var(container_var, member)))
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#endif
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/**
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* container_off_var - get offset of a field in enclosing structure
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* @container_var: a pointer to a container structure
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* @member: the name of a member within the structure.
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*
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* Given (any) pointer to a structure and a its member name, this
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* macro does pointer subtraction to return offset of member in a
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* structure memory layout.
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*
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*/
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#if HAVE_TYPEOF
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#define container_off_var(var, member) \
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container_off(typeof(*var), member)
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#else
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#define container_off_var(var, member) \
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((char *)&(var)->member - (char *)(var))
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#endif
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#endif /* CCAN_CONTAINER_OF_H */
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