Move sync generics to their own packages

The presence of multiple packages in a single directory sometimes
confuses `go mod`, producing output like:
  go: downloading gvisor.dev/gvisor v0.0.0-20210601174640-77dc0f5bc94d
  $GOMODCACHE/gvisor.dev/gvisor@v0.0.0-20210601174640-77dc0f5bc94d/pkg/linewriter/linewriter.go:21:2: found packages sync (aliases.go) and seqatomic (generic_atomicptr_unsafe.go) in $GOMODCACHE/gvisor.dev/gvisor@v0.0.0-20210601174640-77dc0f5bc94d/pkg/sync
  imports.go:67:2: found packages tcp (accept.go) and rcv (rcv_test.go) in $GOMODCACHE/gvisor.dev/gvisor@v0.0.0-20210601174640-77dc0f5bc94d/pkg/tcpip/transport/tcp

PiperOrigin-RevId: 376956213

1 files changed, 76 insertions, 0 deletions

diff --git a/pkg/sync/atomicptrmap/BUILD b/pkg/sync/atomicptrmap/BUILD
new file mode 100644
index 000000000..b0e218c79
--- /dev/null
+++ b/pkg/sync/atomicptrmap/BUILD
@@ -0,0 +1,76 @@
+load("//tools:defs.bzl", "go_library", "go_test")
+load("//tools/go_generics:defs.bzl", "go_template", "go_template_instance")
+
+package(
+    default_visibility = ["//visibility:private"],
+    licenses = ["notice"],
+)
+
+go_template(
+    name = "generic_atomicptrmap",
+    srcs = ["generic_atomicptrmap_unsafe.go"],
+    opt_consts = [
+        "ShardOrder",
+    ],
+    opt_types = [
+        "Hasher",
+    ],
+    types = [
+        "Key",
+        "Value",
+    ],
+    deps = [
+        "//pkg/gohacks",
+        "//pkg/sync",
+    ],
+)
+
+go_template_instance(
+    name = "test_atomicptrmap",
+    out = "test_atomicptrmap_unsafe.go",
+    package = "atomicptrmap",
+    prefix = "test",
+    template = ":generic_atomicptrmap",
+    types = {
+        "Key": "int64",
+        "Value": "testValue",
+    },
+)
+
+go_template_instance(
+    name = "test_atomicptrmap_sharded",
+    out = "test_atomicptrmap_sharded_unsafe.go",
+    consts = {
+        "ShardOrder": "4",
+    },
+    package = "atomicptrmap",
+    prefix = "test",
+    suffix = "Sharded",
+    template = ":generic_atomicptrmap",
+    types = {
+        "Key": "int64",
+        "Value": "testValue",
+    },
+)
+
+go_library(
+    name = "atomicptrmap",
+    testonly = 1,
+    srcs = [
+        "atomicptrmap.go",
+        "test_atomicptrmap_sharded_unsafe.go",
+        "test_atomicptrmap_unsafe.go",
+    ],
+    deps = [
+        "//pkg/gohacks",
+        "//pkg/sync",
+    ],
+)
+
+go_test(
+    name = "atomicptrmap_test",
+    size = "small",
+    srcs = ["atomicptrmap_test.go"],
+    library = ":atomicptrmap",
+    deps = ["//pkg/sync"],
+)