Semaphore is a type of OS and utility software used for managing multiple access to shared resources. It is used to ensure that only one process can access a particular resource at a time and to prevent race conditions, or situations in which two or more processes compete for the same resource. This process is accomplished through the use of a semaphore, a type of synchronization object that is used to control access to shared resources. Semaphores can be used to protect shared memory, shared files, and other shared resources such as printers and ports. Semaphore can also be used to control access to shared data structures such as queues and stacks. Semaphore can also be used to control access to critical sections of code, ensuring that only one thread of execution can enter the critical section at any given time.
Jenkins
Travis CI
Codeship
CircleCI
Azure DevOps
Octopus Deploy
Bitrise
Buildkite
Vexor.io
PeakFlow
Shippable
GreenhouseCI
xinc
Discontinued Source repositories have seen no activity since 2016.