summaryrefslogtreecommitdiff
path: root/vendor/codeberg.org/gruf/go-runners/process.go
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/codeberg.org/gruf/go-runners/process.go')
-rw-r--r--vendor/codeberg.org/gruf/go-runners/process.go73
1 files changed, 0 insertions, 73 deletions
diff --git a/vendor/codeberg.org/gruf/go-runners/process.go b/vendor/codeberg.org/gruf/go-runners/process.go
deleted file mode 100644
index 3feeff258..000000000
--- a/vendor/codeberg.org/gruf/go-runners/process.go
+++ /dev/null
@@ -1,73 +0,0 @@
-package runners
-
-import (
- "fmt"
- "unsafe"
-
- "sync"
-)
-
-// Processor acts similarly to a sync.Once object, except that it is reusable. After
-// the first call to Process(), any further calls before this first has returned will
-// block until the first call has returned, and return the same error. This ensures
-// that only a single instance of it is ever running at any one time.
-type Processor struct{ p atomic_pointer }
-
-// Process will process the given function if first-call, else blocking until
-// the first function has returned, returning the same error result.
-func (p *Processor) Process(proc func() error) (err error) {
- var i *proc_instance
-
- for {
- // Attempt to load existing instance.
- ptr := (*proc_instance)(p.p.Load())
- if ptr != nil {
-
- // Wait on existing.
- ptr.wait.Wait()
- err = ptr.err
- return
- }
-
- if i == nil {
- // Allocate instance.
- i = new(proc_instance)
- i.wait.Add(1)
- }
-
- // Try to acquire start slot by
- // setting ptr to *our* instance.
- if p.p.CAS(nil, unsafe.Pointer(i)) {
- defer func() {
- if r := recover(); r != nil {
- if i.err != nil {
- rOld := r // wrap the panic so we don't lose existing returned error
- r = fmt.Errorf("panic occured after error %q: %v", i.err.Error(), rOld)
- }
-
- // Catch panics and wrap as error return.
- i.err = fmt.Errorf("caught panic: %v", r)
- }
-
- // Set return.
- err = i.err
-
- // Release the
- // goroutines.
- i.wait.Done()
-
- // Free processor.
- p.p.Store(nil)
- }()
-
- // Run func.
- i.err = proc()
- return
- }
- }
-}
-
-type proc_instance struct {
- wait sync.WaitGroup
- err error
-}