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  1. JDK
  2. JDK-8293117

Add atomic bitset functions

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    Backports

      Description

        We need an Atomic version of setting bits, e.g. and/or/xor, like the one in accessFlags for general purpose use.

        From [~jrose]

        Suggestions for API shape:
        Mimic whatever the intel intrinsics do for and/or/xor/add. Prefer their names.
        But, stay within the boundaries of what the C++ atomic API does (omit op-and-fetch, keep only fetch-and-op). Use their names if it makes sense.
        Key requirement: Have the return value contain enough information to infer the previous state of the variable, for those who care.
        Key requirement: Robustly support “set one bit” and “clear one bit”, probably by logior and logand of multi-bit masks.
        Higher-level bit setter could be update_bits(T bits, bool new_state) -> T old_bits. The higher-level setter could use the optimization of not issuing a CAS if the bit (or bits) is (are) in the desired new state already.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8322405 Add atomic bitset functions

            • P3 - Major loss of function.
            • Resolved
            duplicates

            Enhancement - null JDK-8303277 Add Atomic bit operations

            • P3 - Major loss of function.
            • Closed
            relates to

            Enhancement - null JDK-8307495 Specialize atomic bitset functions for aix-ppc

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307496 Specialize atomic bitset functions for bsd-aarch64

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307497 Specialize atomic bitset functions for bsd-x86

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307498 Specialize atomic bitset functions for linux-riscv

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307499 Specialize atomic bitset functions for linux-s390

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307500 Specialize atomic bitset functions for linux-x86

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307501 Specialize atomic bitset functions for linux-aarch64

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307502 Specialize atomic bitset functions for windows-aarch64

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307503 Specialize atomic bitset functions for window-x86

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8307806 Rename Atomic::fetch_and_add and friends

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Enhancement - null JDK-8307926 Support byte-sized atomic bitset operations

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Enhancement - null JDK-8293118 AccessFlags should be just the classfile flags

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8323806 [17u] VS2017 build fails with warning after 8293117.

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Enhancement - null JDK-8293416 ZGC: Set mark bit with unconditional atomic ops

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Enhancement - null JDK-8297539 Use PrimitiveConversions::cast for local uses of the int<->float union conversion trick

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            links to

            Commit Commit openjdk/jdk17u-dev/3809b717

            Commit Commit openjdk/jdk/8a70664e

            Review Review openjdk/jdk17u-dev/2049

            Review Review openjdk/jdk/13711

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                kbarrett Kim Barrett
                coleenp Coleen Phillimore
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                  Created:
                  Updated:
                  Resolved: