retain0() — netty Function Reference

Architecture documentation for the retain0() function in RefCnt.java from the netty codebase.

Function java CommonUtil Internal calls 1 called by 1

Entity Profile

CommonUtil→ Internal→ retain0() — netty Function Reference

Dependency Diagram

graph TD
  87c0d5da_2856_f6c1_81a2_36cf52924564["retain0()"]
  f3598a09_a371_18eb_921b_dedcb34850b7["VarHandleRefCnt"]
  87c0d5da_2856_f6c1_81a2_36cf52924564 -->|defined in| f3598a09_a371_18eb_921b_dedcb34850b7
  2f9c7e0d_83e1_98fc_1a83_b1192ccb6094["retain0()"]
  2f9c7e0d_83e1_98fc_1a83_b1192ccb6094 -->|calls| 87c0d5da_2856_f6c1_81a2_36cf52924564
  2f9c7e0d_83e1_98fc_1a83_b1192ccb6094["retain0()"]
  87c0d5da_2856_f6c1_81a2_36cf52924564 -->|calls| 2f9c7e0d_83e1_98fc_1a83_b1192ccb6094
  style 87c0d5da_2856_f6c1_81a2_36cf52924564 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

common/src/main/java/io/netty/util/internal/RefCnt.java lines 340–349

        private static void retain0(RefCnt instance, int increment) {
            // oldRef & 0x80000001 stands for oldRef < 0 || oldRef is odd
            // NOTE: we're optimizing for inlined and constant folded increment here -> which will make
            // Integer.MAX_VALUE - increment to be computed at compile time
            int oldRef = (int) VH.getAndAdd(instance, increment);
            if ((oldRef & 0x80000001) != 0 || oldRef > Integer.MAX_VALUE - increment) {
                VH.getAndAdd(instance, -increment);
                throw new IllegalReferenceCountException(0, increment >>> 1);
            }
        }