Concurrency

Java Memory Model ,[object Object],[object Object],[object Object],[object Object],[object Object]

Amdahl's law ,[object Object],[object Object]

più CPU, più core, più thread ,[object Object],[object Object],[object Object],[object Object],[object Object]

Cos'è il Java Memory Model? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Java Concurrency 101 ,[object Object],[object Object],[object Object]

Java concurrency 101 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Java concurrency 101 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Java Concurrency in Java5 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Java Thread Specification ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concurrency utilities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concurrency utilities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thread safe: definizione ,[object Object]

Test ,[object Object],[object Object],x = y = 0 x = 1 j = y Thread 1 y = 1 i = x Thread 2 start threads

Output possibile TEMPO 1 1 x = 1 j = y Thread 1 y = 1 i = x Thread 2

Ma anche questo! TEMPO 0 0 x = 1 j = y Thread 1 y = 1 i = x Thread 2

Che è successo? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data Race ,[object Object],[object Object],[object Object],[object Object],[object Object]

Happens Before (HB) ,[object Object],[object Object],[object Object],[object Object]

Happens Before (HB) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Happens Before (HB)? ,[object Object],[object Object],[object Object],[object Object]

Interruzione di un thread ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Interruzione di un thread ,[object Object],[object Object],[object Object],[object Object]

Interruzione di un thread ,[object Object],[object Object],[object Object],[object Object],[object Object]

Test: così funziona? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Test: così funziona? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Test: così funziona? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Test: così funziona? ,[object Object],[object Object],[object Object],[object Object]

CAS: supporto hardware ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CAS: supporto hardware ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CAS e JVM ,[object Object],[object Object],[object Object],[object Object]

Conclusioni ,[object Object],[object Object],[object Object]

Riferimenti ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concurrency

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