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 5

Entity Profile

CommonUtil→ Internal→ retain0() — netty Function Reference

Dependency Diagram

graph TD
  2f9c7e0d_83e1_98fc_1a83_b1192ccb6094["retain0()"]
  e71c7596_f8e0_1394_7485_74fd2ca83bf0["AtomicRefCnt"]
  2f9c7e0d_83e1_98fc_1a83_b1192ccb6094 -->|defined in| e71c7596_f8e0_1394_7485_74fd2ca83bf0
  87c0d5da_2856_f6c1_81a2_36cf52924564["retain0()"]
  87c0d5da_2856_f6c1_81a2_36cf52924564 -->|calls| 2f9c7e0d_83e1_98fc_1a83_b1192ccb6094
  c7f19423_c5ad_a4f9_dc2f_3164b088e51a["retain0()"]
  c7f19423_c5ad_a4f9_dc2f_3164b088e51a -->|calls| 2f9c7e0d_83e1_98fc_1a83_b1192ccb6094
  77b8114c_848a_3218_c7ac_72af15ed5a58["retain()"]
  77b8114c_848a_3218_c7ac_72af15ed5a58 -->|calls| 2f9c7e0d_83e1_98fc_1a83_b1192ccb6094
  bfc7a3f3_f7b2_386a_dd1a_64aacd928e4b["retain()"]
  bfc7a3f3_f7b2_386a_dd1a_64aacd928e4b -->|calls| 2f9c7e0d_83e1_98fc_1a83_b1192ccb6094
  f2976590_e318_61b3_8ee1_df82a5fda531["retain()"]
  f2976590_e318_61b3_8ee1_df82a5fda531 -->|calls| 2f9c7e0d_83e1_98fc_1a83_b1192ccb6094
  87c0d5da_2856_f6c1_81a2_36cf52924564["retain0()"]
  2f9c7e0d_83e1_98fc_1a83_b1192ccb6094 -->|calls| 87c0d5da_2856_f6c1_81a2_36cf52924564
  style 2f9c7e0d_83e1_98fc_1a83_b1192ccb6094 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

common/src/main/java/io/netty/util/internal/RefCnt.java lines 262–271

        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 = UPDATER.getAndAdd(instance, increment);
            if ((oldRef & 0x80000001) != 0 || oldRef > Integer.MAX_VALUE - increment) {
                UPDATER.getAndAdd(instance, -increment);
                throw new IllegalReferenceCountException(0, increment >>> 1);
            }
        }