Add some copy methods

src/LinuxPerf.jl

@@ -118,6 +118,8 @@ struct EventType
     event::UInt64
 end
 
+Base.copy(event::EventType) = EventType(event.category, event.event)
+
 function all_events()
     evts = EventType[]
     for (cat_name, cat_id, events) in EVENT_TYPES
@@ -356,6 +358,12 @@ struct Counter
     running::UInt64
 end
 
+function Base.copy(counter::Counter)
+    return Counter(
+        copy(counter.event), counter.value, counter.enabled, counter.running
+    )
+end
+
 struct Counters
     counters::Vector{Counter}
 end
@@ -734,6 +742,10 @@ struct ThreadStats
     groups::Vector{Vector{Counter}}
 end
 
+function Base.copy(thread_stats::ThreadStats)
+    return ThreadStats(thread_stats.pid, copy(thread_stats.groups))
+end
+
 function ThreadStats(b::PerfBench)
     groups = Vector{Counter}[]
     for g in b.groups
@@ -775,6 +787,8 @@ struct Stats
     threads::Vector{ThreadStats}
 end
 
+Base.copy(stats::Stats) = Stats(copy(stats.threads))
+
 Stats(b::PerfBenchThreaded) = Stats(map(ThreadStats, b.data))
 
 Base.show(io::IO, stats::Stats) = printsummary(io, stats)

test/runtests.jl

@@ -1,7 +1,7 @@
 using LinuxPerf
 using Test
 
-using LinuxPerf: make_bench, enable!, disable!, reset!, reasonable_defaults, counters, EventType, EventTypeExt, parse_groups
+using LinuxPerf: make_bench, enable!, disable!, reset!, reasonable_defaults, counters, EventType, EventTypeExt, parse_groups, Counter, ThreadStats, Stats
 
 @testset "LinuxPerf" begin
 
@@ -97,5 +97,27 @@ end
     @pstats "cpu-cycles,(instructions,branch-instructions,branch-misses),(task-clock,context-switches,cpu-migrations,page-faults),(L1-dcache-load-misses,L1-dcache-loads,L1-icache-load-misses),(dTLB-load-misses,dTLB-loads)" foo!(dest, a, b, c)
 end
 
+@testset "copy structs" begin
+    event = EventType(:hw, :cycles)
+    @test_nowarn copy(event)
+    @test copy(event) === event
+
+    counter = Counter(event, 1, 2, 3)
+    @test_nowarn copy(counter)
+    @test copy(counter) === counter
+
+    thread_stats = ThreadStats(0, [[counter, counter]])
+    @test_nowarn copy(thread_stats)
+    copied_thread_stats = copy(thread_stats)
+    @test copied_thread_stats.pid == thread_stats.pid
+    @test copied_thread_stats.groups == thread_stats.groups
+    @test copied_thread_stats.groups !== thread_stats.groups
+
+    stats = Stats([thread_stats])
+    @test_nowarn copy(stats)
+    copied_stats = copy(stats)
+    @test copied_stats.threads == stats.threads
+    @test copied_stats.threads !== stats.threads
+end
 
 end