Hello Dianne & all good people here Concerning binder thread pool.
I am new to the android and I am confused when mentioned thread pool but I do not see in binder code any thread creation ( aka kthread_create), the only thread that exists in binder driver is Garbage collector . Looking at he code I see that there is binder_thread object that counts ready_threads My understanding that user space spawns threads but binder driver may limit access to service if service application sets this limit calling ioctl( BINDER_SET_MAX_THREADS). Can somebody clarify this issue ? (no threads created in kernel ?) ThanX, Failuch On Thursday, May 6, 2010 10:15:57 PM UTC+3, Vesmar wrote: > > Hi all, > > I m studying how Android creates new processes and found two scenarios. > > when I am running native programs on a terminal on Android (ps, ls, > mkdir, etc) all programs are created in the standard way, that is, > fork (clone) and execve system calls. The process name on task struct > is set by the putname() on the sys_execve syscall handler. > > But when I run a Android application such the Calculator, for example, > i found 6 new tasks (processes or threads) forked by zygote. In fact, > zygote forks just one process and this new process spawns 4 new > processes and set their names using set_task_comm() and the last one > forks an aditional process. And at the last set_task_comm() is called > for the first forked process from zygote. > > So there are two ways for set the task->comm field for a process: The > standard way (using execve and putname()) and a new way used by > Android using sys_prctl who calls set_task_comm(). > > Does anyone have more information on how processes are created on > Android and why a App needs all theis tasks forked by zygote? Why > execve is not used and what is used instead? > > I m using Android for Mips using the Arriba QEMU emulator as my > experimentation platform. > > Thanks, > > -- > unsubscribe: android-kernel+unsubscr...@googlegroups.com > website: http://groups.google.com/group/android-kernel -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
