tmp/tmptzo0g9qx/{from.md → to.md}
RENAMED
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@@ -6,10 +6,13 @@ invocation of the signal handler so installed.
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A *plain lock-free atomic operation* is an invocation of a function `f`
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from [[atomics]], such that:
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- `f` is the function `atomic_is_lock_free()`, or
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- `f` is the member function `is_lock_free()`, or
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- `f` is a non-static member function invoked on an object `A`, such
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that `A.is_lock_free()` yields `true`, or
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- `f` is a non-member function, and for every pointer-to-atomic argument
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`A` passed to `f`, `atomic_is_lock_free(A)` yields `true`.
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@@ -23,12 +26,11 @@ An evaluation is *signal-safe* unless it includes one of the following:
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- an access to an object with thread storage duration;
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- a `dynamic_cast` expression;
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- throwing of an exception;
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- control entering a *try-block* or *function-try-block*;
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- initialization of a variable with static storage duration requiring
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-
dynamic initialization
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-
or
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- waiting for the completion of the initialization of a variable with
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static storage duration [[stmt.dcl]].
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A signal handler invocation has undefined behavior if it includes an
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evaluation that is not signal-safe.
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@@ -37,264 +39,5 @@ The function `signal` is signal-safe if it is invoked with the first
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argument equal to the signal number corresponding to the signal that
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caused the invocation of the handler.
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See also: ISO C 7.14
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-
<!-- Link reference definitions -->
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| 43 |
-
[alg.c.library]: algorithms.md#alg.c.library
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| 44 |
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[alloc.errors]: #alloc.errors
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| 45 |
-
[atomics]: atomics.md#atomics
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| 46 |
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[bad.alloc]: #bad.alloc
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[bad.cast]: #bad.cast
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[bad.exception]: #bad.exception
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[bad.typeid]: #bad.typeid
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[basic.align]: basic.md#basic.align
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[basic.def.odr]: basic.md#basic.def.odr
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[basic.fundamental]: basic.md#basic.fundamental
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[basic.life]: basic.md#basic.life
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[basic.start.dynamic]: basic.md#basic.start.dynamic
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[basic.start.term]: basic.md#basic.start.term
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-
[basic.stc.dynamic]: basic.md#basic.stc.dynamic
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-
[basic.stc.dynamic.allocation]: basic.md#basic.stc.dynamic.allocation
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-
[basic.stc.dynamic.deallocation]: basic.md#basic.stc.dynamic.deallocation
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| 59 |
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[basic.stc.dynamic.safety]: basic.md#basic.stc.dynamic.safety
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| 60 |
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[c.locales]: localization.md#c.locales
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| 61 |
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[c.malloc]: utilities.md#c.malloc
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| 62 |
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[c.math.abs]: numerics.md#c.math.abs
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[c.math.rand]: numerics.md#c.math.rand
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[c.mb.wcs]: strings.md#c.mb.wcs
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| 65 |
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[cfloat.syn]: #cfloat.syn
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[class.mem]: class.md#class.mem
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[class.prop]: class.md#class.prop
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[class.spaceship]: class.md#class.spaceship
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[climits.syn]: #climits.syn
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[cmp]: #cmp
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[cmp.alg]: #cmp.alg
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[cmp.categories]: #cmp.categories
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[cmp.categories.pre]: #cmp.categories.pre
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[cmp.common]: #cmp.common
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[cmp.concept]: #cmp.concept
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[cmp.partialord]: #cmp.partialord
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[cmp.result]: #cmp.result
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[cmp.strongord]: #cmp.strongord
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[cmp.weakord]: #cmp.weakord
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[compare.syn]: #compare.syn
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[complex]: numerics.md#complex
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[concept.totallyordered]: concepts.md#concept.totallyordered
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[constraints]: library.md#constraints
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[conv.ptr]: expr.md#conv.ptr
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[conv.qual]: expr.md#conv.qual
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| 86 |
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[conv.rank]: basic.md#conv.rank
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| 87 |
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[coroutine.handle]: #coroutine.handle
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[coroutine.handle.compare]: #coroutine.handle.compare
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[coroutine.handle.con]: #coroutine.handle.con
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[coroutine.handle.export.import]: #coroutine.handle.export.import
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[coroutine.handle.hash]: #coroutine.handle.hash
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[coroutine.handle.noop]: #coroutine.handle.noop
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[coroutine.handle.noop.address]: #coroutine.handle.noop.address
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[coroutine.handle.noop.observers]: #coroutine.handle.noop.observers
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[coroutine.handle.noop.promise]: #coroutine.handle.noop.promise
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[coroutine.handle.noop.resumption]: #coroutine.handle.noop.resumption
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[coroutine.handle.observers]: #coroutine.handle.observers
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[coroutine.handle.promise]: #coroutine.handle.promise
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[coroutine.handle.resumption]: #coroutine.handle.resumption
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[coroutine.noop]: #coroutine.noop
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[coroutine.noop.coroutine]: #coroutine.noop.coroutine
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[coroutine.promise.noop]: #coroutine.promise.noop
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| 103 |
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[coroutine.syn]: #coroutine.syn
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[coroutine.traits]: #coroutine.traits
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| 105 |
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[coroutine.traits.primary]: #coroutine.traits.primary
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| 106 |
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[coroutine.trivial.awaitables]: #coroutine.trivial.awaitables
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| 107 |
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[cpp.line]: cpp.md#cpp.line
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| 108 |
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[cpp17.nullablepointer]: #cpp17.nullablepointer
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| 109 |
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[csetjmp.syn]: #csetjmp.syn
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| 110 |
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[csignal.syn]: #csignal.syn
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| 111 |
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[cstdarg.syn]: #cstdarg.syn
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| 112 |
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[cstddef.syn]: #cstddef.syn
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| 113 |
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[cstdint]: #cstdint
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| 114 |
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[cstdint.syn]: #cstdint.syn
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| 115 |
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[cstdlib.syn]: #cstdlib.syn
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| 116 |
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[customization.point.object]: library.md#customization.point.object
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| 117 |
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[dcl.fct.def.coroutine]: dcl.md#dcl.fct.def.coroutine
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| 118 |
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[dcl.fct.default]: dcl.md#dcl.fct.default
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| 119 |
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[dcl.init.list]: dcl.md#dcl.init.list
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| 120 |
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[defns.expression-equivalent]: library.md#defns.expression-equivalent
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| 121 |
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[denorm.style]: #denorm.style
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| 122 |
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[except.handle]: except.md#except.handle
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| 123 |
-
[except.nested]: #except.nested
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| 124 |
-
[except.spec]: except.md#except.spec
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| 125 |
-
[except.terminate]: except.md#except.terminate
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| 126 |
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[except.uncaught]: except.md#except.uncaught
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| 127 |
-
[exception]: #exception
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| 128 |
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[exception.syn]: #exception.syn
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| 129 |
-
[exception.terminate]: #exception.terminate
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| 130 |
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[expr.add]: expr.md#expr.add
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| 131 |
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[expr.await]: expr.md#expr.await
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| 132 |
-
[expr.call]: expr.md#expr.call
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| 133 |
-
[expr.context]: expr.md#expr.context
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| 134 |
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[expr.delete]: expr.md#expr.delete
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| 135 |
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[expr.dynamic.cast]: expr.md#expr.dynamic.cast
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| 136 |
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[expr.eq]: expr.md#expr.eq
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| 137 |
-
[expr.new]: expr.md#expr.new
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| 138 |
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[expr.prim.lambda]: expr.md#expr.prim.lambda
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| 139 |
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[expr.rel]: expr.md#expr.rel
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| 140 |
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[expr.sizeof]: expr.md#expr.sizeof
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| 141 |
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[expr.spaceship]: expr.md#expr.spaceship
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| 142 |
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[expr.typeid]: expr.md#expr.typeid
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| 143 |
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[fp.style]: #fp.style
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| 144 |
-
[get.new.handler]: #get.new.handler
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| 145 |
-
[get.terminate]: #get.terminate
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| 146 |
-
[hardware.interference]: #hardware.interference
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| 147 |
-
[initializer.list.syn]: #initializer.list.syn
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| 148 |
-
[intro.multithread]: basic.md#intro.multithread
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| 149 |
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[library.c]: library.md#library.c
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| 150 |
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[limits.syn]: #limits.syn
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| 151 |
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[locale.codecvt]: localization.md#locale.codecvt
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| 152 |
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[multibyte.strings]: library.md#multibyte.strings
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| 153 |
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[new.badlength]: #new.badlength
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| 154 |
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[new.delete]: #new.delete
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| 155 |
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[new.delete.array]: #new.delete.array
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| 156 |
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[new.delete.dataraces]: #new.delete.dataraces
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| 157 |
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[new.delete.placement]: #new.delete.placement
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| 158 |
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[new.delete.single]: #new.delete.single
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| 159 |
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[new.handler]: #new.handler
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| 160 |
-
[new.syn]: #new.syn
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| 161 |
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[numeric.limits]: #numeric.limits
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| 162 |
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[numeric.limits.members]: #numeric.limits.members
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| 163 |
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[numeric.special]: #numeric.special
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| 164 |
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[propagation]: #propagation
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| 165 |
-
[ptr.launder]: #ptr.launder
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| 166 |
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[res.on.data.races]: library.md#res.on.data.races
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| 167 |
-
[round.style]: #round.style
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| 168 |
-
[set.new.handler]: #set.new.handler
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| 169 |
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[set.terminate]: #set.terminate
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| 170 |
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[source.location.syn]: #source.location.syn
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| 171 |
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[stmt.dcl]: stmt.md#stmt.dcl
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| 172 |
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[string.classes]: strings.md#string.classes
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| 173 |
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[support]: #support
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| 174 |
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[support.coroutine]: #support.coroutine
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| 175 |
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[support.dynamic]: #support.dynamic
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| 176 |
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[support.exception]: #support.exception
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[support.general]: #support.general
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[support.initlist]: #support.initlist
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[support.initlist.access]: #support.initlist.access
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[support.initlist.cons]: #support.initlist.cons
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[support.initlist.range]: #support.initlist.range
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[support.limits]: #support.limits
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| 183 |
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[support.limits.general]: #support.limits.general
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| 184 |
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[support.rtti]: #support.rtti
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[support.runtime]: #support.runtime
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[support.signal]: #support.signal
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[support.srcloc]: #support.srcloc
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[support.srcloc.class]: #support.srcloc.class
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[support.srcloc.cons]: #support.srcloc.cons
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[support.srcloc.current]: #support.srcloc.current
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[support.srcloc.obs]: #support.srcloc.obs
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[support.start.term]: #support.start.term
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[support.summary]: #support.summary
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[support.types]: #support.types
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[support.types.byteops]: #support.types.byteops
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[support.types.layout]: #support.types.layout
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[support.types.nullptr]: #support.types.nullptr
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[swappable.requirements]: library.md#swappable.requirements
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[temp.deduct]: temp.md#temp.deduct
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[temp.dep.constexpr]: temp.md#temp.dep.constexpr
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[temp.dep.expr]: temp.md#temp.dep.expr
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[temp.variadic]: temp.md#temp.variadic
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[terminate]: #terminate
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[terminate.handler]: #terminate.handler
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[type.info]: #type.info
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[typeinfo.syn]: #typeinfo.syn
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[uncaught.exceptions]: #uncaught.exceptions
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[unord.hash]: utilities.md#unord.hash
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[utility.arg.requirements]: library.md#utility.arg.requirements
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[version.syn]: #version.syn
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-
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-
[^1]: Possible definitions include `0` and `0L`, but not `(void*)0`.
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-
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-
[^2]: Note that `offsetof` is required to work as specified even if
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-
unary `operator&` is overloaded for any of the types involved.
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-
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-
[^3]: Equivalent to `CHAR_MIN`, `SHRT_MIN`, `FLT_MIN`, `DBL_MIN`, etc.
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-
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-
[^4]: Equivalent to `CHAR_MAX`, `SHRT_MAX`, `FLT_MAX`, `DBL_MAX`, etc.
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-
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[^5]: `lowest()` is necessary because not all floating-point
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-
representations have a smallest (most negative) value that is the
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-
negative of the largest (most positive) finite value.
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| 224 |
-
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-
[^6]: Equivalent to `FLT_MANT_DIG`, `DBL_MANT_DIG`, `LDBL_MANT_DIG`.
|
| 226 |
-
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| 227 |
-
[^7]: Equivalent to `FLT_DIG`, `DBL_DIG`, `LDBL_DIG`.
|
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-
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-
[^8]: Equivalent to `FLT_RADIX`.
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-
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-
[^9]: Distinguishes types with bases other than 2 (e.g. BCD).
|
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-
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-
[^10]: Equivalent to `FLT_EPSILON`, `DBL_EPSILON`, `LDBL_EPSILON`.
|
| 234 |
-
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| 235 |
-
[^11]: Rounding error is described in LIA-1 Section 5.2.4 and Annex C
|
| 236 |
-
Rationale Section C.5.2.4 — Rounding and rounding constants.
|
| 237 |
-
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| 238 |
-
[^12]: Equivalent to `FLT_MIN_EXP`, `DBL_MIN_EXP`, `LDBL_MIN_EXP`.
|
| 239 |
-
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| 240 |
-
[^13]: Equivalent to `FLT_MIN_10_EXP`, `DBL_MIN_10_EXP`,
|
| 241 |
-
`LDBL_MIN_10_EXP`.
|
| 242 |
-
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| 243 |
-
[^14]: Equivalent to `FLT_MAX_EXP`, `DBL_MAX_EXP`, `LDBL_MAX_EXP`.
|
| 244 |
-
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| 245 |
-
[^15]: Equivalent to `FLT_MAX_10_EXP`, `DBL_MAX_10_EXP`,
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| 246 |
-
`LDBL_MAX_10_EXP`.
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| 247 |
-
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-
[^16]: Required by LIA-1.
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| 249 |
-
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-
[^17]: Required by LIA-1.
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-
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-
[^18]: Required by LIA-1.
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-
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-
[^19]: See ISO/IEC/IEEE 60559.
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-
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| 256 |
-
[^20]: Required by LIA-1.
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| 257 |
-
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| 258 |
-
[^21]: Required by LIA-1.
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| 259 |
-
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| 260 |
-
[^22]: Required by LIA-1.
|
| 261 |
-
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| 262 |
-
[^23]: Required by LIA-1.
|
| 263 |
-
|
| 264 |
-
[^24]: ISO/IEC/IEEE 60559:2011 is the same as IEEE 754-2008.
|
| 265 |
-
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| 266 |
-
[^25]: Required by LIA-1.
|
| 267 |
-
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| 268 |
-
[^26]: Required by LIA-1.
|
| 269 |
-
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| 270 |
-
[^27]: Required by LIA-1.
|
| 271 |
-
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| 272 |
-
[^28]: Refer to ISO/IEC/IEEE 60559. Required by LIA-1.
|
| 273 |
-
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| 274 |
-
[^29]: Equivalent to `FLT_ROUNDS`. Required by LIA-1.
|
| 275 |
-
|
| 276 |
-
[^30]: A function is called for every time it is registered.
|
| 277 |
-
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| 278 |
-
[^31]: Objects with automatic storage duration are all destroyed in a
|
| 279 |
-
program whose `main` function [[basic.start.main]] contains no
|
| 280 |
-
objects with automatic storage duration and executes the call to
|
| 281 |
-
`exit()`. Control can be transferred directly to such a `main`
|
| 282 |
-
function by throwing an exception that is caught in `main`.
|
| 283 |
-
|
| 284 |
-
[^32]: The macros `EXIT_FAILURE` and `EXIT_SUCCESS` are defined in
|
| 285 |
-
`<cstdlib>`.
|
| 286 |
-
|
| 287 |
-
[^33]: It is not the direct responsibility of `operator new[]` or
|
| 288 |
-
`operator delete[]` to note the repetition count or element size of
|
| 289 |
-
the array. Those operations are performed elsewhere in the array
|
| 290 |
-
`new` and `delete` expressions. The array `new` expression, may,
|
| 291 |
-
however, increase the `size` argument to `operator new[]` to obtain
|
| 292 |
-
space to store supplemental information.
|
| 293 |
-
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| 294 |
-
[^34]: That is, `a < b`, `a == b`, and `a > b` might all be `false`.
|
| 295 |
-
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| 296 |
-
[^35]: Note that `va_start` is required to work as specified even if
|
| 297 |
-
unary `operator&` is overloaded for the type of `parmN`.
|
| 298 |
-
|
| 299 |
-
[^36]: Such initialization might occur because it is the first odr-use
|
| 300 |
-
[[basic.def.odr]] of that variable.
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| 6 |
A *plain lock-free atomic operation* is an invocation of a function `f`
|
| 7 |
from [[atomics]], such that:
|
| 8 |
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| 9 |
- `f` is the function `atomic_is_lock_free()`, or
|
| 10 |
- `f` is the member function `is_lock_free()`, or
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| 11 |
+
- `f` is a non-static member function of class `atomic_flag`, or
|
| 12 |
+
- `f` is a non-member function, and the first parameter of `f` has type
|
| 13 |
+
cv `atomic_flag*`, or
|
| 14 |
- `f` is a non-static member function invoked on an object `A`, such
|
| 15 |
that `A.is_lock_free()` yields `true`, or
|
| 16 |
- `f` is a non-member function, and for every pointer-to-atomic argument
|
| 17 |
`A` passed to `f`, `atomic_is_lock_free(A)` yields `true`.
|
| 18 |
|
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|
| 26 |
- an access to an object with thread storage duration;
|
| 27 |
- a `dynamic_cast` expression;
|
| 28 |
- throwing of an exception;
|
| 29 |
- control entering a *try-block* or *function-try-block*;
|
| 30 |
- initialization of a variable with static storage duration requiring
|
| 31 |
+
dynamic initialization [[basic.start.dynamic]], [[stmt.dcl]][^34] ; or
|
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|
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| 32 |
- waiting for the completion of the initialization of a variable with
|
| 33 |
static storage duration [[stmt.dcl]].
|
| 34 |
|
| 35 |
A signal handler invocation has undefined behavior if it includes an
|
| 36 |
evaluation that is not signal-safe.
|
|
|
|
| 39 |
argument equal to the signal number corresponding to the signal that
|
| 40 |
caused the invocation of the handler.
|
| 41 |
|
| 42 |
See also: ISO C 7.14
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| 43 |
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