Fix a stuck Steam client on Mac OS X

From time to time, the startup of my Steam client on Mac OS X (10.6.8) is incredibly slow. And sometimes, it won't even launch successfully, getting stuck with a Beach Ball of Death.
A quick diagnostic comes from the powerful utility dtruss:

$ sudo dtruss -p <PID of steam process>
...
__semwait_signal(0x14D03, 0x4D03, 0x1)		 = -1 Err#60
__semwait_signal(0x17C03, 0x3F03, 0x1)		 = -1 Err#60
__semwait_signal(0xC03, 0x0, 0x1)		 = -1 Err#60
semop(0x2000F, 0xB5464C98, 0x1)		 = -1 Err#35
__semwait_signal(0xC03, 0x0, 0x1)		 = -1 Err#60
__semwait_signal(0x4D03, 0x14D03, 0x1)		 = -1 Err#60
...

If you read a LOT of errors on __semwait_signal and semop lines, you can fix your client quite easily. I must say, it might have some side effects, but I've never seen any.
First, kill the Steam client (right-click on it's icon in the Dock, choose "Force Quit"), then list semaphores:

$ ipcs -s
IPC status from <running system> as of Fri Nov 30 21:28:29 CET 2012
T     ID     KEY        MODE       OWNER    GROUP
Semaphores:
s 131072 0xe93c17d9 --ra-------   patpro   patpro
s 131073 0xc0ec4f17 --ra-ra-ra-   patpro   patpro
s 196610 0xb9e1e4e1 --ra-ra-ra-   patpro   patpro
s 131075 0x697a55e6 --ra-ra-ra-   patpro   patpro
s 131076 0x2e726ce1 --ra-ra-ra-   patpro   patpro
s 196613 0xa9ae61d6 --ra-ra-ra-   patpro   patpro
s 131078 0x1a661f70 --ra-------   patpro   patpro
s 196615 0x36dbd757 --ra-------   patpro   patpro
s 196616 0x44433b26 --ra-ra-ra-   patpro   patpro
s 196617 0x3cea9ea0 --ra-ra-ra-   patpro   patpro
s 196618 0xec712fa7 --ra-ra-ra-   patpro   patpro

If your steam client is not running and you read a full list of semaphores, you might want to remove them:

$ for SEM in $(ipcs -s | awk '/^s / {print $2}'); do ipcrm -s $SEM; done

Then, your Steam client should launch faster (well, at a normal speed), and it shouldn't get stuck.
Use at your own risks.

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