Chromium download manager diagram7/31/2023 On other platforms - where Zygote is not used - these tasks are performed immediately by the Renderer process. Zygote process has many responsibilities including document parsing, scheduling tasks, decoding resources, running scripts, starting compositor tasks, etc. The performed operations are called from the loop’s TaskAnnotator or TaskRunner object. It has an inner loop as any other Chromium process. It is created at the startup and later the requisite Renderer processes are forked from it. It is also responsible for dealing with network resources, and URL requests.Īs mentioned on Linux there is a special process called Zygote process. It is capable to perform the policy-allowed actions on behalf of the target process. Browser process hosts the sandbox policy engine service, interception manager and IPC service. Its most important role is the sandbox management. Besides dealing with processes and threads, Browser process has many other important liabilities. These worker threads deal with necessary tasks (such as DNS lookup) and are part of a WorkerPool thread pool (which is a Linux feature). Besides the previously mentioned threads, Browser process spawns so called worker threads as well. There is an extra thread: Process Launcher thread, which is kept to spawn or fork new processes, for example the Zygote or GPU process. DB, File and Cache threads are responsible for handling database connections and queries, file operations and cache management. UI Thread is the main thread of the Browser process which guarantees the responsiveness and event handling of the browser’s UI. There is an I/O Thread which is responsible for the communication with the Renderer thread. It is also called broker process because it has certain privileges, for example starting other processes or supervising the activities of other processes (for example: sandboxed ones).īrowser process spawns separate threads to maintain its main functionalities easier. Last but not least, if hardware acceleration is available on the system, there is an additional process called GPU process.Īs mentioned before the Browser process is the startup process. On Linux-based systems there is also a helper process called Zygote. There is a process called Utility process as well, which is running for a short amount of time but performs important initialization tasks. The other important process - which is available on all platforms when running in multi-processed mode - is the Renderer process. This process is the entry point of the application. The Browser process is the main process on all platforms. There are 2-5 important process types (depending on the platform). IPC and Mojo frameworks are used to achieve this. ![]() The processes communicate with each other through messages.All processes have an inner loop, which deals with task annotation, and communication with other processes.All processes have different responsibilities, but there are some things they all have in common: Chromium / Chrome is a multi-process browser, unless it is launched with the command line option -single-process.
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